20 month old DS woke up at 1.30. It's nearly 5am, still hasn't gone the fuck back to sleep, despite the fact he's knackered. I have to get up at 6am and do a full days work. I've had 2 hours sleep. This has been going on the whole of this week, and has happened every Sunday night for weeks. I feel like screaming. Don't know what the point of this post was really, venting I think. Is 20 month sleep regression a thing??