How long does it take to get over 'developmental' sleep prob

[Schae]

My son is 5 months old and has been waking in the middle of the night for the past 3 weeks. I posted about this a while ago and it was suggested that perhaps it was a developmental thing.
Well, he's started crawling (backwards) and rolls over in his cot. I turn him back over but he takes ages to go back to sleep and will cry and cry and cry.
How long does this go on for? We've been doing the same thing (patting his bum and singing) for the last 3 weeks and it's getting a bit old now.

Thanks in advance

[jayne]

it should be winding down about now i would think... is he teething?? how is he during the day???

[Schae]

I don't think he's teething and last night he slept through.
Thanks for your help though!