Welcome to the MicroTim â¢ Altimeter Website !! Why use a MicroTim Precision Digital Barometric Altimeter / Barometer / VSI? MicroTim is FASTER and MORE ACCURATE than any typical GPS unit or wristwatch altimeter. Â· Lightweight and portable. Easily moves from truck to backpack to recreational vehicle. Dimensions 3âx1.5âx3/4â. Weighs less than 2 oz. Â· Large Display (3/8â tall numbers).
This type of headache occurs while sleeping and is also referred to as alarm clock headaches because they occur at the same time every night. Causes range from changes in small vessels in the cerebrovascular system to previous head injuries. This type of headache is more common in people over the age of 50.
Hypnic headaches, or alarm clock headaches, only occur during sleep. They typically awaken the sufferer at the same time each night, notes the Mayo Clinic. The pain is mild to moderate, and commonly lasts from 15 minutes to two hours or longer. The cause is not known. The headache occurring at the same time each night suggests a link to the circadian rhythms and sleeping/wake cycle, according to an article by E. Kerr and colleagues in the May 2006 Ulster Medical Journal.. Hypnic headaches commonly occur during REM, or dream, sleep.