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.
Insomnia Causes and Risk Factors. Insomnia can have a significant impact on everyday life. Whether you have trouble falling asleep or staying asleep, it can affect your overall health. Relationships and work productivity can also suffer. If you have insomnia, your doctor can help you find out what kind you have.