tell me it will stop?

at the moment 8 month old DD is obsessed with pulling herself up at the sides of the cot, then she inevitably falls or bumps her head, either way it is not helping in the sleep department...

just wondering on average how long this phase lasts - anyone? are we talking days, weeks.... please don't say months?

any tips to stop them hurting themselves? any tips on getting them to sleep, do u go in and lay them back down again or just leave them be...?

any stories or past experiences would be most welcome