Have you tried progressive muscle relaxation or visual relaxation techniques?

Most meds that are specifically for sleep do have associated tolerance and withdrawal.

Anti-histamines have a side effect of relaxation / sleepiness but they can't be used long term.

Are you getting too much sleep? How many hours sleep do you get on average?

Exercise can help tire out your body so you feel more relaxed / sleepy too.

Some people find a benefit to having their bedroom solely as a place to sleep rather than for watching TV or working or stuff like that. Some people find a benefit to rituals like having a hot relaxing bath and drinking a cup of chamomile tea or something like that right before bed time too.