Sleeping Cat

- Tryptophan – The amino acid tryptophan is a building block of proteins. It has been claimed to contribute to sleepiness, since it is a precursor of the neurotransmitter serotonin, involved in sleep regulation. However, no solid data have ever linked modest dietary changes in tryptophan to changes in sleep.
- Marijuana – Some people use marijuana to induce sleepiness. Users often report relaxation and drowsiness. It has been shown that Tetrahydrocannabinol, the principal psychoactive constituent in marijuana, reduces the amount of REM sleep. Frequent users often report being unable to recall their dreams.
• Stimulants
- Amphetamine (dextroamphetamine, and a related, slightly more powerful drug methamphetamine, etc.) are used to treat narcolepsy. Their most common effects are anxiety, insomnia, stimulation, increased alertness, and decreased hunger.