Typically, at least one member of the science party is working at any given hour and the crew works 24 hours a day in six-hour shifts. My body seems to finally be accustomed. Also most of the time I am the only female on the ship. Growing up with lots of sisters, being here took a lot of adjustment. Moreover, if you're only at the start of a five-day cruise, then you know that it will be some time before you're in the relative luxury of your own bed.
Most working vessels are very noisy due to all the pumps and engines.
And you never know what the next morning will be like. With all this going on sometimes it is very hard to sleep. You can't just run out to the corner store and pick up what you've forgotten, so you have to be careful to bring out everything that is needed, or become very good at improvisation.