Real height - measured in the morning or evening?

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Hi guys, I have a question, which bothers me. When someone will ask me about my height, which one I am supposed to choose: the morning one ( 177 cm - a bit below 5.10 ft ) or evening one ( exactly 5.9 ft - 175 cm ), or maybe the mix of them, like after 2-3 hours after waking up ( 176 cm ) or morning + evening / 2 ?
This won't make me higher, but I'm just curious which one way is proper in medical or official point of view. Actually I'm from  Poland so my English can have some mistakes, but I hope You know what I mean 
Ofc, what about posture to measuring, I am barefoot and i soldier salut posture - I hope it is also proper. Thanks in advance

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Agree, but on the other hand, aftter 8 hours of sleep, every spine has equal chance to regenerate. During the day, one person can sit all day, meanwhile taking a nap or lay and other person can walk a low, lift tools, work out in the gym and their spine won't shrink in the same way. Hmmm, also each of us wear shoes, which give 2-3 cm during all time of day. So, to sum up, I'd say, morning height is good way to measure height, but all the people should measure it in the same time. I prefer to measure my height 3-4 hours after waking up - it's my real height, I hope ( 176 cm ).