diff --git a/NightLight.Core.Tests/InteractionListHelpers.fs b/NightLight.Core.Tests/InteractionListHelpers.fs
index 4a2a817..ca2198d 100644
--- a/NightLight.Core.Tests/InteractionListHelpers.fs
+++ b/NightLight.Core.Tests/InteractionListHelpers.fs
@@ -6,8 +6,8 @@ type PartOfDay =
     | Day
     | Night
 
-let startOfDay = TimeSpan.FromHours 6
-let endOfAlarm = TimeSpan.FromHours 6.25
+let startOfDay = TimeSpan.FromHours 5.25
+let endOfAlarm = TimeSpan.FromHours 5.50
 let endOfDay = TimeSpan.FromHours 20.5
 
 let getPartOfDay (dateTime: DateTime) =
diff --git a/NightLight.Core/PartsOfDay.fs b/NightLight.Core/PartsOfDay.fs
index 621ae14..6f5baef 100644
--- a/NightLight.Core/PartsOfDay.fs
+++ b/NightLight.Core/PartsOfDay.fs
@@ -6,7 +6,7 @@ type PartOfDay =
     | Day
     | Night
 
-let private startOfDay = TimeSpan.FromHours 6
+let private startOfDay = TimeSpan.FromHours 5.25
 let private endOfDay = TimeSpan.FromHours 20.5
 
 let getPartOfDay (dateTime: DateTime) =
diff --git a/README.md b/README.md
index 56a365b..d274546 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 This is an F# program that turns all the lights in our apartment
 
 * _red_ at 8.30pm in the evening, and
-* _white_/_yellow_ (depending on the room) at 6.00am in the morning.
+* _white_/_yellow_ (depending on the room) at 5.15am in the morning.
 
 `NightLight.Core` is the functional core, and `NightLight` is the imperative shell.