I use the wind down reminder on the Apple health app under sleep. This gives you a wind down reminder 45 mins before you need to be in bed. I built a habit to drop whatever I’m doing to start getting ready for bed at that point. I turn on sleep focus on my Apple Watch as I go to sleep and seeing that I’ve slept 7.5-8 hours under the health app (along with the deep/core sleep breakdown) gamifies this for me.

Right before I sleep I also do 4-7-8 interval breathing in bed that slows down my heart rate and gets me calm and sleepy. I use a simple app called iBreathe for that. This breathing session also lets my Apple Watch give me an accurate reading for my heart rate variability (HRV) that gamifies this for me.