I agree with Kelly. For 6 weeks that sounds pretty normal... although maybe the day sleeps are a tad too long?

I tend to agree that co-sleeping is nature's way of gently disturbing your baby and thus preventing SIDS. What size is your bed? When we had a double bed i found it a bit squishy but our Queen seems to give us enough room although a King would be better!

I co-slept with my 2nd child the most and now he is the best sleeper of all my kids...eventually he preferred his own space. With my current 20 month old he starts in his bed and comes in at 5/6am. He hasn't decided that he actually has a preference for his own cot yet but I don't refuse him if he cries.

I figure that ultimately you do what is the best fit for both of you. Maybe try the cot/crib beside the bed like others have suggested too.