Vigyan Bhairav Tantra — Dhāraṇā: Awareness in the Gap Between Two Breathsvigyan bhairav tantraThis dhāraṇā points attention to the natural pause after the out-breath ends and before the next in-breath begins — a brief gap with no thought-content in it at all. Resting attention there, even briefly, gives it somewhere to be other than inside the next thought. The instruction is simply to notice that gap, without forcing the breath to pause artificially, and let attention rest there each time it recurs.What it's for

Can't Fall Asleep — This text would say the difficulty is not that you cannot sleep, but that attention has nowhere to be except inside the next thought. In that reading tiredness is beside the point: the body can be thoroughly spent and the mind still will not settle, because each thought is where attention is living. What it offers is a smaller place to rest — the turn between the breath coming in and the breath going out, which is there whether or not the thinking has stopped.

Nighttime Anxiety — This text does not treat a mind racing at bedtime as a sleep problem at all. It reads it as attention having nowhere to rest except inside the next thought — so each thought becomes the place attention lives, and the body cannot stand down while that continues, however tired it is.