Our sweet baby had her first set of vaccines today, and she seems to be very tired, restless, and cranky. She has been asleep since her appointment at noon today. Is it ok to let her sleep all day since she probably isn't feeling good, or should I be trying to encourage periods of alertness still. I don't want her to be up all night if I let her sleep all day. She is still waking to eat, she's just very fussy. Thanks!