I know about the crying when you leave the room thing. That is normal at this age!

My MCHN gave me a brochure for 6-9 months and it says:

Your baby and other people

Over the months, babies have learned a lot about the people around them. Between 6 and 9 months they:
- recognise people they see everyday
- are wary of strangers and less familiar people
- will cry if their mother is out of sight even for a short time. They cannot understand that she has not left forever. Games like peek-a-boo help teach babies that people and things exist even when they are not seen.

This is a normal stage in your child's development as they are beginning to know the difference between familiar and unfamiliar people.

As for the sleeping I can't really help there. Cooper has always chopped and changed on me!!! Although he's been a bit fussy at night recently and I think it's because he's teething (two teeth have just broken the skin).