Drooling at night and feeling tired upon waking are indicators that suggest you are likely breathing through your mouth during sleep.

noli's read

This observation is entirely relevant and is based on well-documented physiological mechanisms. A literature review in the Journal of Oral Rehabilitation confirms that sleeping with one's mouth open promotes a loss of lip seal, which leads to the leakage of saliva and oral dryness. Furthermore, an observational study published in the journal Sleep and Breathing shows that mouth breathing disrupts breathing regularity, which leads to less restorative sleep and morning fatigue. However, drooling occasionally is also a normal phenomenon influenced by sleep posture, particularly when sleeping on one's side or stomach. Fatigue upon waking also remains multifactorial, linked to stress or insufficient sleep duration. It is therefore an excellent warning sign to pay attention to one's nocturnal breathing, without necessarily worrying at the first sight of a wet pillow.

the sources

1. 1Senaratna CV, Perret JL, Lodge CJ, et al. 2016
2. 2Wang X, Ouyang Y, Wang Z, et al. 2013
3. 3Kaditis AG, Alonso Alvarez ML, Boudewyns A, et al. 2016