I am up All. Night. Long. With DS2, 7mo, who wakes every hour and needs a bf to sleep. He has had reflux so I hold him upright afterwards. When he is at a certain angle, or horizontal, I can her a faint ticking/clicking/ popping sound coming from inside his nose. It is quite rhythmical, sometimes it could be a heartbeat but more often it's just random. Quite fast. Could sound like a very distant dripping tap.
It's been there as long as I can remember. Could it be 'the thing' that is preventing him sleeping properly?! Also shld mention that he snores and is always mildly congested. (Stuffy but dry).