Hypersomnia

Also desire to sleep; like of sleeping; tendency to sleep; profuse sleeping. Pronounced drowsiness and a tendency to sleep for long periods day or night. They patient may awaken when called to, but easily goes back to sleep.

• If accompanied by heavy-headedness and heavy body, it is a sign that the spleen is encumbered by phlegm-damp, which may either stem from external contraction of summerheat-damp or from phlegm-damp arising from within.
• When accompanied by dizziness, headache, and hypertonicity of the shoulder and back, it is a sign of wind-phlegm.
• With cold limbs and faint pulse, and pronounced general weakness, it is a sign of heart-kidney yáng vacuity and is referred to in On Cold Damage (伤寒论 shāng hán lùn), where it states, When the lesser yīn (shào yīn) is affected by disease..., there is desire only for sleep.
• Drowsiness after eating with poor appetite, scantness of breath, and lack of strength is a sign of spleen qì vacuity.

See also clouding sleep

Etymology

Chin 嗜 shì, like to; 睡 shuì, sleep.