No caffeine at all in the afternoon (after 12pm).

White noise machine.

Earplugs & Eye mask on stand-by.

Proper pillow and mattress selection. Pillows lose their level of comfort over time.

All clocks are covered once alarms are set, so their light and the time cannot accidentally be seen in the middle of the night upon waking.

No activities requiring intense concentration during hour before bed.

Having a nightly routine of "getting ready for bed".