你晚上睡好了,对吧?可能是你同学睡着了,这对你来说是加压,让你感到压力很大.(sleep建议改为过去式slept)
以下句子为强调句：
It is probably just the added pressure of all your classmates being asleep that is stressing you out.
可以简化成：It is pressure that is stressing you out.
probably和just都是副词,前者表示推测,后者加强语气.
of all your classmates being asleep,是pressure的定语.