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.
Unhealthy lifestyles and sleep habits can create insomnia on their own (without any underlying psychiatric or medical problem), or they can make insomnia caused by another problem worse. Examples of how specific lifestyles and sleep habits can lead to insomnia are: 1  You work at home in the evenings. 2  You take naps (even if they are short) in the afternoon. 3  You sometimes sleep in later to make up for lost sleep.  You are a shift worker (meaning that you work irregular hours).