It contains minerals such as pyroxene, amphibole, feldspar and 63-68 percent silica. The eruption temperature for dacitic lava is 1,500 to 1,800 degrees Fahrenheit. Dacitic to rhyolitic lava is so dangerous because it contains a high amount of crystals. Mt. Vesuvius erupts according to the Plinian model of eruption.
Nightmares-whether they are just dreams or a sleep disorder-may disrupt normal sleep-wake cycle and create a perception of inadequate sleep or insomnia. There are a lot factors that may trigger insomnia or prevent it from resolving quickly (like temporary jet leg insomnia).ightmares usually occur during REM or dream sleep whereas night terrors usually occur during deeper stages of sleep and may be associated with screaming. Except for the connections noted above there is generally no association between nightmares and night terrors and insomnia.
Although 7 1/2 hours of sleep is about average, some people do well on four to five hours of sleep. Other people need nine to 10 hours of sleep each night. Insomnia can affect not only your energy level and mood, but also your health as well because sleep helps bolster your immune system.nsomnia symptoms may include: -Difficulty falling asleep at night-Waking up during the night-Waking up too early-Daytime fatigue or sleepiness-Daytime irritability Common insomnia causes include: -Stress. Concerns about work, school, health or family can keep your mind too active, making you unable to relax.