I don't sleep well on passages even with a skipper onboard.
The longest I did solo was 3 days and 2 nights I will stay up as long as I can drinking coffee till 2 or 3am and then sleep in 20 minute periods with a alarm on my chest till the sun comes up.
I know a Spanish global sailor that sleeps in the day and sails at night he seems to think the ships can see him better during the day!
Anyway I'm over getting beat up at sea ! now I'm just a day sailor looking forward to enjoying the sights and getting sheltered sleep in my new island bed!