My ex and I have done part-time parenting since my youngest (now 20 months) was 7 months.  He was sleeping through the night (around 5 hours at a time) on and off up until about 5 months ago.  Now, he barely sleeps when he's at my place but when he's at his Dad's place, he sleeps around 10 hours every night.  We have a solid bedtime routine which he's taken to pretty well but he's still up several times a night.  He's super clingy with me but according to his Dad, he not...