My 15 week DS goes to bed at 7, dreamfeeds at 10.30, then stirs - but doesn't wake - between 3 and 4. With his eyes closed, and still half asleep he usually starts sucking his fingers aggressively, slurping away. Does this mean he's hungry? He doesn't always wake but I wake him to feed - he was in hospital around 6 weeks, and is still catching up, but almost there and I don't want to wake him unless anymore unless you think it means he's hungry? He never cries for food in the night, so not sure of the cues.