diff --git a/SleepFocus/Screens/ProfileScreen.swift b/SleepFocus/Screens/ProfileScreen.swift
index 0572e18..7d6b7ce 100644
--- a/SleepFocus/Screens/ProfileScreen.swift
+++ b/SleepFocus/Screens/ProfileScreen.swift
@@ -390,6 +390,9 @@ struct SmartAlarmSettingsScreen: View {
     @State private var displayedSmartAlarmSchedule = ""
     @State private var smartAlarmDisplayOpacity = 1.0
     @State private var pendingSmartAlarmRefresh = false
+    @State private var showOutOfBoundsAlert = false
+    @State private var outOfBoundsAlertMessage = ""
+    @State private var suppressPreferenceOnChange = false
 
     private enum EditorSection {
         case sleepGoal
@@ -427,6 +430,11 @@ struct SmartAlarmSettingsScreen: View {
         } message: {
             Text("Live Activities are currently disabled. Open Settings to allow lock screen and Dynamic Island smart alarm updates.")
         }
+        .alert("Out of bounds", isPresented: $showOutOfBoundsAlert) {
+            Button("OK", role: .cancel) { }
+        } message: {
+            Text(outOfBoundsAlertMessage)
+        }
         .toolbar {
             ToolbarItem(placement: .navigationBarTrailing) {
                 Button {
@@ -461,6 +469,7 @@ struct SmartAlarmSettingsScreen: View {
             Task { await refreshGuidanceAndScheduleIfNeeded(forceRefresh: true) }
         }
         .onChange(of: sleepPreferences.smartAlarmWakeTimeMinutes) { _, _ in
+            guard !suppressPreferenceOnChange else { return }
             if sleepPreferences.smartAlarmMode == .wake {
                 beginIdealBedtimeFetchTransition()
                 scheduleGuidanceRefreshAndSync()
@@ -482,6 +491,7 @@ struct SmartAlarmSettingsScreen: View {
             }
         }
         .onChange(of: sleepPreferences.smartAlarmBedtimeMinutes) { _, _ in
+            guard !suppressPreferenceOnChange else { return }
             if sleepPreferences.smartAlarmMode == .bedtime {
                 beginSmartAlarmFetchTransition()
                 scheduleGuidanceRefreshAndSync()
@@ -496,6 +506,7 @@ struct SmartAlarmSettingsScreen: View {
             scheduleGuidanceRefreshAndSync()
         }
         .onChange(of: sleepPreferences.earliestWakeupMinutes) { _, _ in
+            guard !suppressPreferenceOnChange else { return }
             if sleepPreferences.smartAlarmMode == .wake {
                 beginIdealBedtimeFetchTransition()
             } else {
@@ -504,6 +515,7 @@ struct SmartAlarmSettingsScreen: View {
             scheduleGuidanceRefreshAndSync()
         }
         .onChange(of: sleepPreferences.finalWakeupMinutes) { _, _ in
+            guard !suppressPreferenceOnChange else { return }
             if sleepPreferences.smartAlarmMode == .wake {
                 beginIdealBedtimeFetchTransition()
             } else {
@@ -513,6 +525,23 @@ struct SmartAlarmSettingsScreen: View {
         }
     }
 
+    private var allowedWakeWindowMinutes: (earliest: Int, latest: Int) {
+        (earliest: sleepPreferences.earliestWakeupMinutes, latest: sleepPreferences.finalWakeupMinutes)
+    }
+
+    private func normalizedMinutes(_ minutes: Int) -> Int {
+        ((minutes % 1440) + 1440) % 1440
+    }
+
+    private func isWithinAllowedWakeWindow(_ minutes: Int, window: (earliest: Int, latest: Int)) -> Bool {
+        minutes >= window.earliest && minutes <= window.latest
+    }
+
+    private func presentOutOfBoundsAlert(_ message: String) {
+        outOfBoundsAlertMessage = message
+        showOutOfBoundsAlert = true
+    }
+
     private var inputTimeBinding: Binding<Date> {
         Binding(
             get: {
@@ -526,7 +555,21 @@ struct SmartAlarmSettingsScreen: View {
             set: { updatedDate in
                 switch sleepPreferences.smartAlarmMode {
                 case .wake:
+                    let previousMinutes = sleepPreferences.smartAlarmWakeTimeMinutes
+                    let attemptedMinutes = SleepPreferencesStore.minutesSinceMidnight(from: updatedDate)
+                    let window = allowedWakeWindowMinutes
+                    guard isWithinAllowedWakeWindow(attemptedMinutes, window: window) else {
+                        presentOutOfBoundsAlert("That alarm time (\(sleepPreferences.timeDisplay(for: attemptedMinutes))) is outside your allowed wake window (\(sleepPreferences.timeDisplay(for: window.earliest))–\(sleepPreferences.timeDisplay(for: window.latest))). Resetting to the previous alarm time.")
+                        suppressPreferenceOnChange = true
+                        sleepPreferences.updateSmartAlarmWakeTime(sleepPreferences.date(for: previousMinutes))
+                        suppressPreferenceOnChange = false
+                        return
+                    }
+                    suppressPreferenceOnChange = true
                     sleepPreferences.updateSmartAlarmWakeTime(updatedDate)
+                    suppressPreferenceOnChange = false
+                    beginIdealBedtimeFetchTransition()
+                    scheduleGuidanceRefreshAndSync()
                 case .bedtime:
                     beginSmartAlarmFetchTransition()
                     sleepPreferences.updateSmartAlarmBedtime(updatedDate)
@@ -545,9 +588,25 @@ struct SmartAlarmSettingsScreen: View {
     private var bedtimeBinding: Binding<Date> {
         Binding(
             get: { sleepPreferences.date(for: sleepPreferences.smartAlarmBedtimeMinutes) },
-            set: {
+            set: { updatedDate in
+                let previousBedtimeMinutes = sleepPreferences.smartAlarmBedtimeMinutes
+
+                suppressPreferenceOnChange = true
+                sleepPreferences.updateSmartAlarmBedtime(updatedDate)
+                suppressPreferenceOnChange = false
+
+                let recommendedWakeMinutes = normalizedMinutes(sleepPreferences.smartAlarmWakeTimeMinutes)
+                let window = allowedWakeWindowMinutes
+                guard isWithinAllowedWakeWindow(recommendedWakeMinutes, window: window) else {
+                    presentOutOfBoundsAlert("That bedtime would recommend a wake time (\(sleepPreferences.timeDisplay(for: recommendedWakeMinutes))) outside your allowed wake window (\(sleepPreferences.timeDisplay(for: window.earliest))–\(sleepPreferences.timeDisplay(for: window.latest))). Resetting to the previous bedtime.")
+                    suppressPreferenceOnChange = true
+                    sleepPreferences.updateSmartAlarmBedtime(sleepPreferences.date(for: previousBedtimeMinutes))
+                    suppressPreferenceOnChange = false
+                    return
+                }
+
                 beginSmartAlarmFetchTransition()
-                sleepPreferences.updateSmartAlarmBedtime($0)
+                scheduleGuidanceRefreshAndSync()
             }
         )
     }
@@ -555,14 +614,62 @@ struct SmartAlarmSettingsScreen: View {
     private var earliestWakeBinding: Binding<Date> {
         Binding(
             get: { sleepPreferences.date(for: sleepPreferences.earliestWakeupMinutes) },
-            set: { sleepPreferences.updateEarliestWakeup($0) }
+            set: { updatedDate in
+                let previousMinutes = sleepPreferences.earliestWakeupMinutes
+                suppressPreferenceOnChange = true
+                sleepPreferences.updateEarliestWakeup(updatedDate)
+                suppressPreferenceOnChange = false
+
+                let window = allowedWakeWindowMinutes
+                if sleepPreferences.smartAlarmEnabled {
+                    let currentWakeMinutes = normalizedMinutes(sleepPreferences.smartAlarmWakeTimeMinutes)
+                    if !isWithinAllowedWakeWindow(currentWakeMinutes, window: window) {
+                        presentOutOfBoundsAlert("That wake-window change would put your next alarm (\(sleepPreferences.timeDisplay(for: currentWakeMinutes))) outside the allowed wake window (\(sleepPreferences.timeDisplay(for: window.earliest))–\(sleepPreferences.timeDisplay(for: window.latest))). Resetting to the previous window.")
+                        suppressPreferenceOnChange = true
+                        sleepPreferences.updateEarliestWakeup(sleepPreferences.date(for: previousMinutes))
+                        suppressPreferenceOnChange = false
+                        return
+                    }
+                }
+
+                if sleepPreferences.smartAlarmMode == .wake {
+                    beginIdealBedtimeFetchTransition()
+                } else {
+                    beginSmartAlarmFetchTransition()
+                }
+                scheduleGuidanceRefreshAndSync()
+            }
         )
     }
 
     private var finalWakeBinding: Binding<Date> {
         Binding(
             get: { sleepPreferences.date(for: sleepPreferences.finalWakeupMinutes) },
-            set: { sleepPreferences.updateFinalWakeup($0) }
+            set: { updatedDate in
+                let previousMinutes = sleepPreferences.finalWakeupMinutes
+                suppressPreferenceOnChange = true
+                sleepPreferences.updateFinalWakeup(updatedDate)
+                suppressPreferenceOnChange = false
+
+                let window = allowedWakeWindowMinutes
+                if sleepPreferences.smartAlarmEnabled {
+                    let currentWakeMinutes = normalizedMinutes(sleepPreferences.smartAlarmWakeTimeMinutes)
+                    if !isWithinAllowedWakeWindow(currentWakeMinutes, window: window) {
+                        presentOutOfBoundsAlert("That wake-window change would put your next alarm (\(sleepPreferences.timeDisplay(for: currentWakeMinutes))) outside the allowed wake window (\(sleepPreferences.timeDisplay(for: window.earliest))–\(sleepPreferences.timeDisplay(for: window.latest))). Resetting to the previous window.")
+                        suppressPreferenceOnChange = true
+                        sleepPreferences.updateFinalWakeup(sleepPreferences.date(for: previousMinutes))
+                        suppressPreferenceOnChange = false
+                        return
+                    }
+                }
+
+                if sleepPreferences.smartAlarmMode == .wake {
+                    beginIdealBedtimeFetchTransition()
+                } else {
+                    beginSmartAlarmFetchTransition()
+                }
+                scheduleGuidanceRefreshAndSync()
+            }
         )
     }
 
@@ -770,6 +877,7 @@ struct SmartAlarmSettingsScreen: View {
                     .font(.system(size: 13, weight: .semibold))
                     .foregroundColor(.appSecondaryText)
 
+
                 // if let compensationText = sleepPreferences.smartAlarmSleepGoalCompensationText {
                 //     Text(compensationText)
                 //         .font(.system(size: 12))