Some common signs and symptoms of insomnia include:
Waking up tired from lack of sleep
Daytime sleepiness and fatigue
Mood changes
Poor concentration and attention
Anxiety
Headaches
Lack of energy
Increased errors and mistakes

Sleep Hygiene would be the number area to work on to help with insomnia. It consists of the following strategies:

Sleep as much as possible to feel rested, then get out of bed (do not over-sleep).
Maintain a regular sleep schedule. Go to bed and wake up at the same time daily.
Do not force yourself to sleep.
Do not drink caffeinated beverages or other stimulants in the afternoon or evening.
Do not drink alcohol prior to going to bed.
Do not smoke, especially in the evening.
Adjust the bedroom environment to induce sleep.
Avoid watching television in bed and for 30 minutes before bed.
Do not go to bed hungry, but avoid foods that may cause acid reflux.
Resolve stress and anxiety before going to bed.
Exercise regularly, but not 4-5 hours prior to bed time.