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Model insomnia by methylphenidate and caffeine and use in the evaluation of temazepam
Abstract:
Experimental sleep disturbances (model insomnia) were produced by the administration of methylphenidate (MPD) 10 mg and caffeine (CAF) 150 mg. The effect of temazepam (TEM), 15 mg or 30 mg, on the model was investigated. All-night polysomnography was performed on 8 normal young male subjects under each of the following 9 conditions: baseline, MPD 10 mg, CAF 150 mg, TEM 15 mg, TEM 30 mg, MPD + TEM 15 mg, MPD + TEM 30 mg, CAF + TEM 15 mg, CAF + TEM 30 mg. A reduction in total sleep time and total amount of stage REM (S-REM) sleep and an increase in the sleep latency and wake time (S-W) were observed in both the MPD and CAF nights. The sleep latency was significantly longer in the CAF night than in the MPD night. Administration of TEM 15 mg or TEM 30 mg alone caused very few modifications in the sleep parameters. These drugs in combination with MPD or CAF resulted in almost complete recovery of the sleep disturbance induced by MPD or CAF. The results indicate that CAF and MPD produced similar models of insomnia except for a greater sleep latency for CAF than for MPD. Both models were useful in the evaluation of hypnotic drugs such as temazepam.
Insights
Methylphenidate (MPD) and caffeine (CAF) induced insomnia models in healthy males. Temazepam (TEM) effectively reversed these sleep disturbances, demonstrating its hypnotic potential.
Area of Science:
- Pharmacology
- Sleep Medicine
- Neuroscience
Background:
- Developing reliable models of insomnia is crucial for evaluating hypnotic medications.
- Stimulants like methylphenidate (MPD) and caffeine (CAF) can disrupt sleep architecture.
Purpose of the Study:
- To investigate the effects of MPD and CAF on sleep parameters in healthy young males.
- To evaluate the efficacy of temazepam (TEM) in reversing MPD- and CAF-induced sleep disturbances.
Main Methods:
- All-night polysomnography was conducted on 8 healthy male subjects under 9 conditions.
- Conditions included baseline, MPD (10 mg), CAF (150 mg), TEM (15 mg or 30 mg) alone and in combination with MPD or CAF.
Main Results:
- MPD and CAF significantly reduced total sleep time and REM sleep, while increasing sleep latency and wake time.
- CAF induced a significantly longer sleep latency compared to MPD.
- Temazepam, particularly at 30 mg, largely restored normal sleep patterns when co-administered with MPD or CAF.
Conclusions:
- MPD and CAF provide valid experimental models for insomnia, with distinct effects on sleep latency.
- Temazepam demonstrates significant hypnotic efficacy in reversing stimulant-induced sleep disturbances.