If you can only choose from these two time periods, of course, you should choose 10 to sleep at 3 o'clock. There is a saying of "taking a nap" in health preservation, which refers to midnight (at night 1 p.m. to early morning 1 p.m.) and noon (at day1p.m. to afternoon1p.m.). These two periods are the "rest" time of various organs of the human body, especially the liver. During these two periods, rest can make the liver get a full rest, the liver can remove endotoxin from the same strain as the liver and kidney, and an energetic liver can drive an active kidney, so no matter how you arrange the rest of the time, you must sleep at noon. A reasonable and adequate sleep will definitely make you full of energy all day and keep yourself efficient in your studies. In addition, if you can't keep a good sleep, even if you study hard, your efficiency will be very low, not only your memory will drop, but your attention will be distracted. So I suggest you make sure you sleep well every day.