The safety of<unk> is not fully known. While<unk> has been successful for some, it is necessary to rigidly maintain the desired sleep/wake cycle thenceforth. Any deviation in schedule tends to allow the body clock to shift later again.<unk> has been known to cause non-24-hour sleep–wake disorder in at least three recorded cases, as reported in the New England Journal of Medicine in 1992. Animal studies have suggested that such lengthening could "slow the intrinsic rhythm of the body clock to such an extent that the normal 24-hour day no longer lies within its range of entrainment."
Chronotherapy 
Triage
Umbrella review
Voluntary counseling and testing
Molecular risk assessment
Nutriepigenomics
Confabulation
Twelve-step program