Insomnia is a common type of sleep disorder. You have trouble falling and/or staying asleep. If you do get an adequate amount of sleep, it may feel like you obtained no sleep at all because you do not wake up refreshed. Insomnia can be short-term or ongoing. Short-term form of the medical condition is generally caused by events like a family emergency or stress at work. The chronic form of the medical condition is a side effect of another medical problem such as hypertension. Signs of this medical condition include sleeping for short periods of time, inability to fall asleep and spending most of the night away.Next