Normal behavior?

Jennifer • FTM, BFP after 15 mos. ❤️ - #blessed

Over the last week, my 3mo son has been falling asleep randomly on his play mat, in our laps, etc. He's usually pretty through with a schedule... Eat, Diaper, Play and Nap... But suddenly he's randomly falling asleep for 20-40 minutes at a time... Two or three times a day.

Is this normal behavior? FTM and it's kinda freaking me out.