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Common signs and symptoms of insomnia may include:

• Difficulty falling asleep
• Difficulty staying asleep or waking up too early
• Waking up feeling tired, even after a full night’s sleep
• Daytime fatigue or sleepiness
• Inability to concentrate
• Irritability
• Anxiety
• Depression
• Forgetfulness
• Chronic pain

Although insomnia may cause tiredness, lack of energy, difficulty concentrating or irritability during daytime hours, some people with the condition experience less sleepiness during the day than people without the condition. This is because some people with insomnia experience problems with the body’s sleep-arousal system, which helps people feel awake after sleeping and tired before going to bed.

People with insomnia may also experience an impaired sense of sleep, meaning they believe they are not sleeping but sleep tests prove they are.

Insomnia may also cause problems with interpersonal relationships and job performance. People who experience sleep deprivation due to chronic insomnia face twice the risk of automobile accidents than those experiencing fatigue for other reasons.