We are going through this at the moment too (in fact, I am listening to ds2 scream in his bed right now). He is 7.5 months and I too was sick of getting up in the night a hundren times to put it back in again. His quality of sleep was very poor as a result. My ds1 found his thumb at 9 weeks old and was an excellent sleeper. Ds2 will not suck his thumb. I have nothing against a dummy - and if he could pick it up and put it in himself, then he could keep it. But as he can't, I ditched them last night. The night wasn't so bad, by the daytime sleeps today have been hell. Hopefully this won't last forever, or my neighbours may end up reporting me to SS!