I've been taking 200 mgs of L-Theanine every morning for a year and a half along with 100 mgs of 5-HTP.

The sensory deprivation systems have also caused psychosis. They have been outlawed in many jurisdictions and the US Army Field manual. Lawsuits are ongoing about whether they are cruel and unusual punishment in the US or torture by Geneva Convention standards.

Float tank clinics sometimes add a measured level of stimulation.