'Good morning' is usually a salutation while 'good night' is said while parting for the night.
My question is basically "What do you say to your friends when you're about to sleep in the morning? What is the morning version of 'good night'?
Learn English – What do you say to your friends when you’re about to sleep in the morning? What is the morning version of ‘good night’
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Times:
Dawn refers to the time around the actual solar event that is sunrise.
Morning refers to any time before noon, so 1am is still the morning.
Very early morning is sometimes known as "the small hours" (or any regional variant of those words). The actual time is variable, although you will probably provoke a laugh from working people if you refer to any time after 7am in that way (and probably any time after 6am).
Noon refers to 12pm (exact midday) and the time just around it. 1101 is not noon.
Afternoon refers to the time after Noon and before the Night. "Good afternoon" is only used after noon.
Dusk corresponds to dawn, and refers to the event of the sun setting.
Evening is variable in its usage, and is tied both to work schedules and the solar time. It's pretty much always correct to refer to the part of the day when the light begins to wane as "evening".
Night refers to the time after sunset. Accordingly, it can be both morning and night (this being pretty much the definition of the small hours).
Midnight refers to exactly 0000/2400 hours, and the time just around it. 2301 is not midnight.
"Good night" does not mean "have a good sleep". It is used as a farewell when it is late, whether anyone is planning on going home or not.
Meals:
Lunch is a meal taken between breakfast and the evening meal (howsoever called). It is not tied to any specific time beyond that.
The main evening meal may be called "dinner", "supper", or "tea" depending on regional dialect and class. "Dinner" is probably the most neutral option in most dialects (although in some dialects it means the main meal of the day even if that was lunch, or it may mean something else). If a second evening meal is taken, or a very late evening meal is taken, it might be called supper in distinction to dinner. This is not so common any longer.
"Afternoon tea" is a specific meal. Its defining feature is not really that it is taken in the afternoon, but rather the elements it is composed of: it will be a short snack, usually of tea or coffee and a sweet or savory baked good. "Morning tea" is the corresponding snack in the morning.
We are not "fixing" you, because you are not broken. We are correcting you in so far as we think you are wrong.
It's a bit odd. I would have expected to hear "have a nice nap", as someone who's going to sleep at 1:00 pm is probably only going to sleep for an hour or two.
If you planned to sleep for seven or eight hours, starting at 1:00 p.m., that's longer than a nap. I guess in that case "sleep well" (or "rest well", or "sleep tight", if you prefer) would be more appropriate. "Sweet dreams" would technically work, but it's not usually used except with people you are very familiar with (children, romantic partners, family, etc.). You could also use "sleep well" at night — it's not restricted to napping or sleeping for long periods during the day.
Also, you can use "good night" for situations other than going to sleep. I often hear it used when people go their separate ways after spending some time at night together, they say "good night" as they are parting.
Best Answer
Somebody has asked a very similar question here some time back and got many good answers:
Alternatives to "Good Night" when sleeping in the afternoon
Considering the situation in your specific question,
(1) If you are going to sleep in the morning and your friends are not, then you would tell them to have a good day -- you could also say "I'm going to hit the sack" where HIT THE SACK means go to sleep.
http://dictionary.cambridge.org/dictionary/english/hit-the-sack
(2) If your friends were also going to sleep in the morning then you could very well use "good night" with the meaning of 'sleep well' as suggested in the earlier answer.
(3) Consider "good morning" which can be used not only as salutation but also as a parting statement as in "it was nice meeting with you but I must be off now, GOOD MORNING." This may be used even if you (or the other person) were actually going to sleep thereafter, though this information would not be expressed in that particular statement:
Pl. note that 'good morning' can legitimately be used in this sense but many prefer to say good day.
(4) Some parting statements that refer to sleep without stating the time of day (and thus ideal for your case) include the following common expressions already suggested in answers to that earlier question linked above: