Is it normal to get less than an hour of sleep for several days in a row?

on wednesday i went to sleep at around 8 am , and my alarm clock woke me up at 9, on thursday i went to sleep at around 5:30 and had to get up around 6:15 that day. and last night i went to sleep at around 6:30 and woke up around 7:30. I dont stay out late or anything, i just stay up by myself, i just stay up. im not tired at all, i just stay up because i literally have no urge to go to sleep