There are tired, sleepy, sleeping and weary emoticons 😫😩😵😴😪, but no emoji just for Yawning from either boredom or exhaustion.

Implementations

• :-O Wechat and QQ emojis list #359
• (yawn) Skype emoticons list #253
• |-) Microsoft/Windows Live / MSN Messenger emoticons list #256

Petitions

• Emoji Request