急!关于英语几个词用法的区分.帮个忙,谢谢!

sleep
n.睡眠,静止,昏迷,麻木,长眠,冬眠,睡意
It seems that you haven't got enough sleep.看来你睡眠不足.
sleepy
adj.欲睡的,困乏的
I was deadly sleepy.我困极了.
She suddenly started to feel very sleepy.她突然感到非常困倦.
asleep
adj.麻木的,睡着的,睡熟了的
Is the baby still asleep?这个婴儿还在睡觉吗?
He seems to be fast asleep.他好象睡得很熟.
adv.熟睡地 Their anxieties were put asleep.他们的焦虑平息了.
sleeper
n.枕木,睡眠者,卧铺
I'm a light sleeper.我是一个睡觉很轻的人 / 我睡觉时很容易惊醒.
I booked a first-class sleeper.我订了头等卧铺车票.
slept sleep的过去式和过去分词
Today,I have slept for 14 hours.今天,我睡了14 小时.
sleepless
adj.不睡眠的,不休息的,睡不着的,睡不著的
I've spent many sleepless nights worrying about it.我已度过了许多不眠之夜,为此事担心.