The goal is for them to sleep 10-12 hours at night, usually closer to 12 is best! They are little and growing so quickly they need all that sleep!! At 3 months mine was sleeping 12 hours every night with two 2 hour naps and 1 catnap in the evening... so no need to worry!! I do stand by the old saying of never wake a sleeping baby, sure does make my little man grumpy if I have to!! Enjoy the sleep!