Dream suppression can be described as a suppression of the vividness, intensity, frequency, and recollection of one's dreams. At its lower levels, this can be a partial suppression which results in one having dreams of a lesser intensity and a lower rate of frequency. However, at its higher levels, this can be a complete suppression which results in one not experiencing any dreams at all.
In the context of psychoactive substance usage, this effect can occur when certain compounds are ingested before a person sleeps. It is most commonly experienced under the influence of cannabis and other cannabinoids. This is due to the way in which they reduce REM sleep, the phase of sleep in which the majority of dreams occur.
Compounds within our psychoactive substance index which may cause this effect include:
- Responsible use
- Subjective effects index
- Dream potentiation
- Psychedelics - Subjective effects
- Dissociatives - Subjective effects
- Deliriants - Subjective effects
- Effect of illicit recreational drugs upon sleep: cocaine, ecstasy and marijuana (ncbi) | https://www.ncbi.nlm.nih.gov/pubmed/18313952
- Effects of high dosage delta-9-tetrahydrocannabinol on sleep patterns in man (ncbi) | https://www.ncbi.nlm.nih.gov/pubmed/164314
- REM SLEEP – TYPES AND STAGES OF SLEEP (howsleepworks.com) | https://www.howsleepworks.com/types_rem.html