If you are congested (allergies/cold), how does the nasal passages become less congested during sleep?

Question

If you are congested (allergies/cold), how does the nasal passages become less congested during sleep?

In: 199

Answer 1

An actual eli5: your head is higher than the rest of your body since it’s on your pillow so your boogers slide down the back of your nose, down your throat and into your belly.