and energizing effect , heightens the senses, and promotes alertness and concentration. This effect can last for several hours—it is estimated that in an adult, caffeine should have a half-life of about four hours—and interfere with our sleep-wake cycle .
- Alcoholic beverages
Alcohol interferes with the normal sleep cycle : although it helps us fall asleep faster, it worsens the quality of sleep , promotes nighttime awakenings, and causes dehydration. Furthermore, this substance appears to reduce the REM phase, the phase in which we dream and the brain actually rests.
- Very fatty or fried
