Milo has done this too - for the past 2-3 weeks my baby has been waking, screaming, at least 2-3 times a night, which he has not done since he was 8 weeks old. I am really missing my 10-12 hour sleeping baby, who now is not sleeping during the day much either, so has gone from 13-15 hours sleep a day down to around 10-11.

Its driving me insane. I now have to go to bed at 8pm every night in the hope of getting some sleep before it starts up.