Is it possible for baby to...

FTM, I've been tracking baby movements for over a month now and I'm almost positive my baby is active at night and sleeping (quiet) during day time. Last night for the first time baby was not moving at night and I was able to sleep soundly. Then I woke up scared wondering why my baby was so quiet. At around 9 am my belly was moving like crazy. She's been active and bouncing all day and now right now she's calmed down. Is it possible for babies to switch like that?? What is going on?! Advice? Thanks.