Cat,

Blake's been doing the same - I'm sort of putting it down to me going back to work (even though it started before then), 4mth vaccs, some really dry skin (bad bad case of cradle cap that migrated over his whole body and face) and a slight cold (runny nose and slight cough). Worked out that if he sleeps in the "recovery position" (first aid term) on his side in the cot he might sleep longer than flat on his back.