The day sheet
The Night Shift Moves to Noon: How to Tell Her Sleep Clock Has Flipped Before You Lose Every Night
When she sleeps through the morning and wakes when the house goes dark, three days on the day sheet will show the shift before your own sleep goes with it.
Most days start with one line on the sheet: the time she got up. When that line starts sliding, write it down before anything else changes. A wife whose sleep has flipped may nap through the morning, stay awake from late evening into the small hours, and call for you each time you finally lie down.
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What to write down for three days
Use the left column of the day sheet. Mark the time she fell asleep, the time she woke, every nap longer than about twenty minutes, and every time you were up with her overnight. Do not round the times or guess at them. Three days of plain entries are enough to show a pattern.
How to tell a pattern from a bad night
One rough night means very little. Look for the same shape across several days: a nap that starts after lunch and runs past dinner, a wake-up at the same hour two mornings in a row, a restless stretch that begins when the lights go off. If the shape repeats, the clock has moved, and the sheet is now the evidence you bring to someone else.
What to change on the sheet first
Move your own sleep blocks to the hours she is quietest, even if they are short. Open the curtains in the morning and keep the room bright during the day. At night, keep the room dim and quiet and write the bedtime routine as a set of lines in order, so the next person on the sheet follows the same steps you do.
What you cannot settle alone
Bring the log to her doctor. The doctor decides what the change means and whether anything else needs a look. You are not diagnosing it. You are handing over a record. If you have a paid helper, the early-morning or overnight watch can go on the handoff line with a start and stop time, but the helper's job is the watch and the errand list, not changing her routine.
Set your own limit before you need it
Decide how many nights in a row you can run on broken sleep before you call for relief. Write that number at the bottom of the sheet. When the sheet reaches it, the next step is already on paper, and you do not have to decide it at two in the morning.