So DD has been asleep for 1 hr 40 min and since the 40 minute mark, she's been stirring and waking up, cry a little, then quiet down and it seems like she's asleep again. Every 5 minutes or so she does this. Do you think she's getting rest? How long do I let her keep doing this?

PS. She did have a long day yesterday visiting the in-laws. She only took 3 naps... 30 min, 1.5 hr, and 30 min. Maybe she's catching up on sleep?