Insomnia is divided into three types: Transient: lasting only a few days; Short-term: lasting up to three weeks; Chronic: lasting three weeks or longer.

Below is a list of factors that can lead to insomnia:

Physical Conditions:
1. Bone, pancreas, and brain cancers
2. Toothache
3. Arthritis
4. Headache/Backache
5. Food poisoning
6. Hypertension
7. Premenstrual syndrome/Menstruation/Pregnancy/Menopause
8. Physical injury
9. Respiratory problems (asthma, hay fever, bronchitis, cold)
10. Restless legs
11. Sleep apnea

Environmental Situations:
1. Allergy from house dust mites
2. Bedroom temperature
3. Lighting
4. Noise (traffic, neighbors, partner’s snoring)

Psychological Problems:
1. Tension/Anxiety
2. Any psychiatric disorder
3. Depression/Grief
4. Excitement/Anticipation
5. Post-traumatic stress disorder
6. Worry/Stress

Habits:
1. Nicotine/Alcohol/Illicit drugs
2. Beta blockers
3. Caffeine (chocolate, colas, tea, coffee)
4. Corticosteroids/ Antidepressants/Asthma remedies/Nasal decongestants
5. Daytime napping
6. Night shifts/Eating too late at night
7. Strenuous late night exercise
8. Sudden weight loss from dieting
9. Theophylline
10. Withdrawal from psychoactive drugs