I’m finding my sleep is getting lighter and lighter and I wake up from most noises made by people I cohabit with at night. If I’m woken up at around 2 am by their bathroom visit I fall asleep within an hour or less depending on whether I take melatonin. If I’m woken up around 6-7 I don’t fall asleep again. I don’t wake up when there’s no people around. I pretty much can’t fall asleep anymore without some help from melatonin since I’ve started using it (I take 20 mg). I’m getting about 5 hours of sleep this way. What can be done to improve the quality of sleep?