My 2 year old is being a monkey at bedtime. We quickly learnt that getting cross, or repeatedly putting her back to bed wasn't working. The only thing which did work was giving her no attention. Until she tried a new trick which I cannot ignore - taking her nappy and pyjamas off. Funny at first, but not after weeks of putting the nappy back on over a 1 or 2 hour period every night. Any tips?