How to Hygge Sleep
It seems that the best way to hygge sleep is to get enough morning exposure to bright light. But once you have done that, another good idea is to create a nighttime routine that helps you sleep.
Here are some ideas...
If, during winter, you turn on lots of lights in the morning, turn off a few at dusk, and maybe soften the light of the ones that remain on at night. Let the shift in available light send cues to your brain that it's nighttime. Using a dawn simulator or light box will help even more.
Give yourself time to unwind an hour or two before you hope to go to sleep. Make yourself a cup of chamomile or lavender tea, light a candle, and read a book until you begin to feel sleep. Blow out the candle right before you go to sleep, and eventually, just doing that will be a familiar reminder that it's sleep time.
Put on comfy pajamas or your sleep shirt during the wind down time, so it helps to relax you and so that it is one less step you have to take during the process of getting into bed.
Now, this next recommendation is going to be the hardest one. Power down before trying to go to sleep. If you can, give yourself an hour without any stimulation from electronics.
Plan and create a hygge bedtime ritual that works for you. You might prefer to spray lavender on to your pillowcase, instead of drinking it in a tea. Maybe you will only need half an hour without your devices.
But just doing the same thing every night and giving yourself time to relax and unwind could be of powerful benefit.