"excessive sleep" is correct and usable in written English.
You can use it when referring to an unusually large or longer than usual amount of sleep. For example, "Tony has been having excessive sleep lately."
Some professions even demand excessive sleep deprivation as part of the job or a "rite of passage".
This study examined the morbidity, as measured by health-related quality of life (HRQOL), mortality, and quality-adjusted life years (QALY) due to suboptimal (inadequate or excessive) sleep.
Aging, paraventricular white matter lesion (WML), macroangiopathy, high levels of alcohol, a lack of hobbies, and excessive sleep were risk factors for vascular cognitive impairment no dementia (VCIND).
With further research we may find that excessive sleep proves to be an early indicator of increased stroke risk, particularly among older people".
It is understood that regularly getting adequate sleep — seven to eight hours per night — is important to health, and both insufficient sleep (six or fewer hours) and excessive sleep (nine hours or more) have been linked to significant health problems.
The American Psychiatric Association defines dysthymia as depressed mood most of the time for at least two years, along with at least two of the following symptoms: poor appetite or overeating; insomnia or excessive sleep; low energy or fatigue; low self-esteem; poor concentration or indecisiveness; and hopelessness.
But a recent study suggests that excessive, undisturbed sleep may be a problem, too.
If you have excessive fatigue, sleep problems or persistent muscle soreness, you are probably trying to do too much.
Indeed, ventilatory settings adjusted during wakefulness may become excessive during sleep, as the patients' ventilatory demand is reduced while asleep [16].
Excessive stress, sleep deprivation, and a demanding lifestyle can increase the risk of burnout, leading to erosion of empathy in physicians.
Indeed, ventilatory settings adjusted during wakefulness may become excessive during sleep, as the patients' ventilatory demand is reduced while asleep [ 16].
