Lesson 4 of 6
The one with the most leverage
There is a long list of things that are supposed to help. Most of them are fine and almost none of them move the needle by much.
One does. A single protected stretch of unbroken sleep, arranged in advance with another adult, on as many nights as you can get it.
The reason is lesson two. The damage is coming from the breaking rather than from the total, so the thing to buy back is not hours in bed, it is one stretch that nobody interrupts. That is a different purchase and it usually needs another person to make it possible.