1、sleep
的意思是“睡觉,睡眠”，可以作为名词用，跟在形容词后面；
而sleeping
是
sleep
的现在分词或动名词，是形容词，可作前置定语，另外它还是个动名词。
例：
You have a good sleep.
你需要好好睡一觉。
the
sleeping
car
卧车车厢
2、sleepy是sleep
的形容词形态,作表语,意为“瞌睡的、困倦的”;作前置定语,意为“寂静的”；
而asleep是表语形容词,只能做“表语”,意思是“睡着的“，作宾语补足语,指状态。
例：
Last night I sleep very well.
我昨天晚上睡得很好。
The children have been asleep.
孩子们已睡着了。
He
goes
to
bed
very
late
every
day,so
he
often
feels
sleepy.
他每天睡得很迟，因此经常感到困乏。
She is always sleepy.
她总是想睡觉
3、fall
asleep
是动词词组，
意思是”入睡“，表示刚刚睡觉时的状态。
He was too tired and fell asleep at once.

他太累了，立刻就睡着了。
He
has
fallen
asleep.

扩展资料
1、I
didn't
sleep
well
last
night.
So
I'm
feeling
sleepy.
2、Don't
make
any
noise.
There
is
a
sleeping
baby
here.
3、He
was
fast
asleep.
I
couldn't
wake
him
up.
4、Humans
and
animals
generally
have
innate sleep
-
wake cycles
close
to
but
not
exactly
24
hours.