BACKGROUND: How is happiness generated via brain function in lucky individuals who have the good fortune to be happy? Conceptually, well-being or happiness has long been viewed as requiring at least two crucial ingredients: positive affect or pleasure (hedonia) and a sense of meaningfulness or engagement in life (eudaimonia). Science has recently made progress in relating hedonic pleasure to br...

issue of Dentistry Today and can be found in our archived articles at the Web site dentistrytoday.com. INTRODUCTION At the start of the classic 1960s television show The Twilight Zone, we see a clock floating through black empty space. The unmistakable voice of the show's creator, Rod Serling, states that time is the hidden dimension ; the unknown. Without knowing what will happen in the future...

There are dramatic and physiologically relevant changes in both skylight color and intensity during evening twilight as the pathlength of direct sunlight through the atmosphere increases, ozone increasingly absorbs long wavelengths and skylight becomes increasingly blue shifted. The moon is above the horizon at sunset during the waxing phase of the lunar cycle, on the horizon at sunset on the n...

Few studies have investigated hallucinations that occur at the onset/offset of sleep (called hypnagogic/hypnopompic hallucinations; HHHs), despite fact their prevalence in general population is reported to be higher than daytime hallucinations. We utilized data from an epidemiological study explore HHHs various modalities. also phenomenological differences between sleep-related (HHHs) and audit...