I know babies sleep patterns change as they develop but I was not expecting this. My son is almost 5 months, and though he was never great at napping he did do it and got what he needed. Three weeks ago he began getting up twice in the night again. Before he was sleeping through for a full 15 hours. And then he began finding it impossible to sleep for longer than 10 minutes. This leaves him cranky, tired, fussy and is affecting everything. Even his appetite has changed. Can anyone give me advice on how I can help him to nap?