For example, when one person hugs another, most observers silently assume that the back patting that occurs towards the end of the hug is a gesture of affection and that the air kisses made - the sound made on the side of someone's cheek - is also affection.
D-Ribose helped my energy levels and helped me cope mentally with paperwork at work. I feel almost back to normal. The side effect was waking early in the morning, sometimes as early as 2am and not being able to get back to sleep. This causes side effects which offset the gain in energy levels.
Medications and drugs that cause insomnia include amphetamines, beta blockers, caffeine, cocaine, ephedra, pseudoephedrine, and theophylline. High doses of hormones -- such as DHEA, testosterone, progesterone, pregnenolone are also responsible for many cases. Even certain herbs can cause insomnia.