A few options.
- Buy really oversized sheets and tuck in the corners way under the mattress.. I have had good success with this and did not have a problem with the sheets coming up.
- Buy oversized non fitted sheets and sew one to fit the bottom. Have done this and it isn't a tricky sewing job at all.
- Have custom sheets made. Several companies offer these but way cheaper to do it yourself.
Making up the bed, depends. 35-37' 98% of the boats you will be sleeping in a V-berth forward. Most people sleep with their head
aft in a V-berth so easy to climb up, tuck in the foot of the bed in the bow then pull the sheets and cover flat from the head
If a double in an aft cabin
depending on the boat I sleep head aft so pulling the sheets to the head of the bed might require climbing across the bed but most aft cabin
doubles do have some side access so not a problem.
If none of the above I just make do.