2. Sleep Disturbances Connected to Mental Health
Psychological issues often manifest in disrupted sleep. Conditions like chronic stress, panic disorders, or depression can cause restless nights, fragmented sleep, or excessive muscle tension. When your sleep is irregular, your body may not swallow saliva as efficiently, resulting in a wet pillow upon waking.

3. Nightmares and Night Terrors
Frequent nightmares or night terrors, often associated with anxiety or unresolved emotional conflicts, can spark physical responses during sleep. During these intense episodes, saliva production may increase, and drooling can happen. People who wake abruptly from a nightmare might spot their pillow is wet without remembering why.