"Sleep well" vs " Sleep tight"

[Zuhair Abbas]

Hi,

Is there any difference between the meaning of the following:

1. Sleep well.
2. Sleep tight.
3. Sweet dreams.

Is there any other expression to say the same.

Thanks in advance

Zuhair

[5jj]

Is there any difference between the meaning of the following:

1. Sleep well.
2. Sleep tight.
3. Sweet dreams.

#2 is more likely to be said to a child, I feel; possibly #3 as well. #1 can be said to anybody.