Some nights cost you the next day and some do not, and the number on the clock is a poor guide to which is which. Time in bed is not time asleep, and quality swings far more than duration does. That is why “I got eight hours and I still feel wrecked” is such a common and confusing sentence.
The way to sort it out is to stop counting hours and start recording the evening around them.
Which nights tend to cost the most?
The ones that show up repeatedly in people’s own records:
- The shifted night. Not short, just two hours later than usual. Your body notices the move more than the total.
- Alcohol close to bed. You fall asleep fast and the second half of the night falls apart.
- Late caffeine. Often six or more hours before bed, and still doing damage.
- A late heavy meal, or a day where you barely ate until evening.
- A warm room.
- The weekend lie-in. Two extra hours on Saturday and Sunday produces a Monday that feels like jet lag, because it is a mild version of the same thing.
- A loud day. Stress does not stop at bedtime.
Any one may cost you nothing. The combinations are where the wrecked days come from.
What should I log?
For two weeks:
- Bedtime and wake time.
- How rested you felt, out of 5, first thing.
- Wake-ups in the night, even roughly.
- Last caffeine and any alcohol, with times.
- Last meal, with the time.
- How the next day went, out of 5, in the evening.
Six lines. Adding more fields makes the log harder to keep and does not make the answer clearer.
How do I read it?
Rank your last fourteen days by how the following day went, then read the nights at each end.
You are looking for what shows up before the bad days and rarely before the good ones. Most people find one obvious candidate and one surprise. The obvious one is usually alcohol or a late night. The surprise is usually consistency: the weeks where bedtime stayed within an hour of itself beat the weeks with more total sleep and a wandering schedule.
If every night looks the same and the days still vary, that is useful too. It points away from sleep and towards what the days themselves contain.
How Lopie does it
Lopie takes it in one sentence. “Bed at midnight, woke twice, glass of wine at ten, felt about a two today.” Lopie files each part separately with its time, so you are not filling in a sleep form at the exact moment you least want to.
Sleep arrives from Apple Health with a sleep score, so the nights are on record without you guessing at them, and they sit on the same timeline as your evening meals, caffeine and routines. After about 14 days Lopie shows what tends to line up with the nights that cost you the next day. In one real example, late caffeine lined up with 18 lost sleep points while a wind-down routine lined up with 12 gained.
Those are associations in your own entries. Lopie does not claim a cause.
See which nights cost you the next day.
Download Lopie for iPhone (free)Lopie is free to download, with a 7-day free trial of Lopie+ (then $69.99/year or $2.99/week).
What to change first
Bedtime consistency, before anything else. Pick a window of one hour and keep the whole week inside it, weekends included. It is the least glamorous change on the list and the one that shows up fastest in a two-week record. Move the last caffeine earlier second. Everything else can wait until you have seen what those two do.
Related guides
- Why Do Some Mornings Start Rough?
- The Afternoon Crash: What Lines Up With It
- How to Track Habits Automatically
Lopie is a wellness and journaling companion, not a medical device. It shows possible patterns in what you logged, nothing more.