Excessive Sleepiness

Overview

Excessive sleepiness is the tendency to fall asleep or doze off during the day — while reading, working, watching television, or even driving — despite what seems like enough sleep at night. It is distinct from fatigue, which is tiredness without an urge to sleep. Sleepiness matters because it affects concentration, work and safety, and it often points to poor-quality or insufficient sleep or to a sleep disorder such as obstructive sleep apnoea. It can also be a feature of a medical condition such as a thyroid disorder or uncontrolled diabetes.

Common causes

• Insufficient sleep or an irregular sleep schedule.
• Poor-quality sleep from pain, frequent urination, or reflux.
• Obstructive sleep apnoea — common with snoring, obesity and daytime sleepiness.
• Shift work and disrupted sleep-wake rhythms.
• Medication effects — sedatives, antihistamines and some antidepressants.
• Thyroid disorders, especially hypothyroidism.
• Uncontrolled diabetes.
• Depression and other mood disorders.
• Chronic fatigue and anaemia, which can overlap with sleepiness.

Symptoms and associated features

The hallmark is an irresistible urge to sleep during the day. Associated features guide the cause: loud snoring, witnessed pauses in breathing and waking unrefreshed suggest sleep apnoea; weight gain and cold intolerance suggest hypothyroidism; thirst and frequent urination suggest diabetes; and low mood or loss of interest suggest a mood disorder. A simple sleep diary and, where indicated, a partner’s account of night-time breathing are very useful.

Evaluation and investigations

Evaluation reviews the sleep pattern, schedule, snoring and daytime impact, and uses targeted tests to look for medical causes: thyroid function tests, blood sugar or HbA1c, a complete blood count, and kidney and liver function. When sleep apnoea is suspected, a sleep assessment (often a home sleep study) is arranged. See Respiratory & Breathing Problems for snoring and sleep-related breathing concerns, and Thyroid Disorders and Diabetes & Metabolic Health.

Management overview

Management is directed at the cause. Sleep hygiene and a regular schedule help when sleep is simply insufficient; sleep apnoea is managed with weight loss, a sleep device or specialist referral; a thyroid disorder or diabetes is treated specifically; and medicines that cause drowsiness are reviewed. Daytime sleepiness is not managed with stimulants in isolation — the underlying sleep or medical cause is addressed.

Follow-up and monitoring

Follow-up confirms the daytime sleepiness is improving and that any sleep study findings or medical causes have been addressed. Persistent sleepiness despite treatment is reviewed for less common causes and referred for specialist sleep assessment when appropriate.

Warning signs — seek prompt care

• Sleepiness severe enough to cause drowsiness while driving — address before driving again.
• Sleepiness with loud snoring and witnessed pauses in breathing — assess for sleep apnoea.
• Sleepiness with weight gain and cold intolerance — check the thyroid.
• Sleepiness with thirst, frequent urination and weight loss — check blood sugar.

How we help

Dr. Nayak identifies whether sleepiness comes from poor sleep, a sleep disorder or a medical cause, arranges targeted testing and a sleep study where indicated, and treats the underlying cause — referring for specialist sleep assessment when needed. Consultations are available in-clinic in Bhubaneswar and over teleconsultation.

Related conditions and patient concerns

• Daytime Sleepiness
• Fatigue
• Snoring & Sleep-related Breathing Concerns
• Thyroid Disorders
• Diabetes & Metabolic Health
• Obesity & Weight Management