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| Biological Clock Alterations |
| All human beings have biological "clocks" deep within their brains. These clocks control regular fluctuations in body functions, such as hormone secretions, temperature regulation and sleep-wake cycles. The clock controlling sleep-wake periods typically cycles every 25 hours (interestingly not synchronized with our 24-hour day). In some people, however, this "normal" cycle can become abnormally shortened or prolonged. The commonest way this is experienced is in the form of jet lag. |
| Medications |
| Prescription and OTC (over-the-counter) medicines used to treat medical or psychiatric problems can also contribute to insomnia. If you are having trouble sleeping, look very carefully at any medicines you may have been taking recently or just prior to the onset of your problem: |
| Bronchodilators (asthma remedies) |
| Beta blockers (used for high blood pressure, heart disease, migraines, palpitations) |
| Steroids (mainly prednisone/cortisone preparations) |
| Calcium blockers (used for high blood pressure, heart disease, migraines, palpitations) |
| "Nondrowsy" OTC decongestants and cold remedies |
| Dilantin (diphenylhydantoin) |
| Thyroid hormones |
| Caffeine is often used by people to maintain wake-fulness throughout the day. Excessive use of caffeine |
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