sleep- or lack of it!

Alexandra
Is anyone else struggling with sleep? 
I do get to sleep but my husband is a night owl, and inevitably wakes me up after a couple of hours. I can never get back to sleep.
7w6d today and I'm just exhausted all the time. I struggle to nap during the day even though I try. 
My doctor prescribed melatonin but so far it's not helping. 
Is it just me or is anyone else struggling with sleep- anyone have any tips to help?