假設你是某外國語中學高三學生李華。最近，你發現同學們在上課時有睡覺的現象，請你寫一封倡議書，倡議大家規律作息，摒棄不良習慣。要點如下：
1.提出現象并分析其原因；
2.說明其危害；
3.發出倡議。
注意：1.詞數120左右：
2.可以適當增加細節，以使行文連貫；
3.開頭已給出，不計入總詞數。
Dear fellow students，
_____

【考點】提綱作文；倡議書．

【答案】Dear fellow students，
Recently，it has been common that many of us keep drifting away or even fall asleep in class.I think the main reason is that many students stay up late for various reasons，such as unfinished assignments，drinking too much coffee or being addicted to digital devices.Lack of sleep has several side effects.It not only reduces our learning efficiency，but also weakens our immune system.Our health will be harmed seriously，and so it is with our sleep and energy cycles.
Adjust our schedule，take physical exercise，rest regularly，keep away from digital devices before sleep，and make better use of our time in class.All of these contribute to a healthy life and high efficiency in study.
Let's take action from now on.