5 month old sleeping a lot today

Brittney

my son is going to be 5 months old pretty soon. he usually sleeps pretty well but today he's been sleeping almost all day. Should I wake him up or should I let him keep sleeping, I just don't want him to be up all night. But I heard you're not supposed to wake up a baby. side note: he usually sleeps all night long and takes about two to three short naps during the day but he's really awake and alert during the day that's why I'm concerned