Dream suppression is defined as a decrease in the vividness, intensity, frequency, and recollection of a person's dreams. At its lower levels, this can be a partial suppression which results in the person 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 the person not experiencing any dreams at all.
Dream suppression is most commonly induced under the influence of moderate dosages of cannabinoids and most types of antidepressants. This is due to the way in which they increase REM latency, decrease REM sleep, reduce total sleep time and efficiency, and increase wakefulness. REM sleep is where the majority of dreams occur.
Compounds within our psychoactive substance index which may cause this effect include:
Annectdotal reports which describe this effect with our experience index include:
- Schierenbeck, Thomas; Riemann, Dieter; Berger, Mathias; Hornyak, Magdolna (2008). "Effect of illicit recreational drugs upon sleep: Cocaine, ecstasy and marijuana". Sleep Medicine Reviews. 12 (5): 381–389. doi:10.1016/j.smrv.2007.12.004. ISSN 1087-0792.
- Sharpley, Ann L.; Cowen, Philip J. (1995). "Effect of pharmacologic treatments on the sleep of depressed patients". Biological Psychiatry. 37 (2): 85–98. doi:10.1016/0006-3223(94)00135-P. ISSN 0006-3223.
- Trivedi, M (1999). "Effects of Fluoxetine on the Polysomnogram in Outpatients with Major Depression". Neuropsychopharmacology. 20 (5): 447–459. doi:10.1016/S0893-133X(98)00131-6. ISSN 0893-133X.
- Vogel, G.W.; Buffenstein, A.; Minter, K.; Hennessey, Ann (1990). "Drug effects on REM sleep and on endogenous depression". Neuroscience & Biobehavioral Reviews. 14 (1): 49–63. doi:10.1016/S0149-7634(05)80159-9. ISSN 0149-7634.
- Feinberg, I., Jones, R., Walker, J. M., Cavness, C., & March, J. (1975). Effects of high dosage delta‐9‐tetrahydrocannabinol on sleep patterns in man. Clinical Pharmacology & Therapeutics, 17(4), 458-466. https://www.ncbi.nlm.nih.gov/pubmed/164314
- Hobson, J. A., Stickgold, R., & Pace-Schott, E. F. (1998). The neuropsychology of REM sleep dreaming. Neuroreport, 9(3), R1-R14. https://www.ncbi.nlm.nih.gov/pubmed/9512371