My 13 month old is very sleepy today. She slept almost all night last night (that’s not normal for her.) today she has napped for about 4 hours at two separate naps and now at 6:30 she is so tired she just laid around (again DEFINITELY not normal) so I laid her in her crib and she went right to sleep. Both of her naps I noticed she laid flat on her back she’s been a tummy sleeper since she could roll over at 4 months. I’m just concerned. She’s never been like this. Is it normal for kids to go through periods where they are just more sleepy? She doesn’t seem to be sick, no coughing, vomiting, sneezing, or fever. Just really lethargic.