Well, for almost two months now, I have intermittent lung crackles
when laying down or reclining, and they are usually especially noticeable when I wake up from sleep at night or when I wake up in the morning.
They are virtually non-existent during the day.
The sound usually begins as a single pop in the center of my chest and occurs at late-inspiration, and sometimes one or more pops follow it, at varied areas across my chest.