Lots of Macs have Problems staying asleep, when you put them there (Like with a short press on the Power Button). If you google "mac wakes up from sleep by itself" you get 22 million results. I myself have 2 MacBooks Pro that have these Problems and wasted a lot of hours for finding the root cause.
If the MacBook wakes, see if there is any activity from HID (Touchpad, Keyboard etc.) within one minute. If not, go to sleep again.
This would save lots of energy for the enviroment and my personal wallet I would gratify it with another donation to you of 40€.