If you spend the day on the beach or in the sands, or splashing in the ocean then walking on the sand, make sure you shower when you return to your hotel room and do NOT put any clothes you have worn on your bed or near other clothes. The no-see-ums will stick to you & be transferred to your bed sheets. They will keep you awake all nite in your bed, if you have contaminated the sheets or other clothes. Don't ask how I know this.
I used to wander down to the beach before breakfast, walk around barefoot & splash my feet around in the water, then come back to my hotel room, sit on the bed, (which is when the bugs transferred,) before heading out for the rest of the day.