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Authentication - Do you use email address instead of user name?
  v1.0 Posted at 10/12/2014 7:03 AM by Tiago Araujo

It is easier for users to remember their frequently accessed email address more so than one of their many user names. For this reason, it is best to use email address instead of user name for the sign in page.

"I do recommend letting users enter their email address instead of a user ID: It's guaranteed to be unique and it is easy to remember."

Jakob Nielsen, Ph.D. and Principal at Nielsen Norman Group

Figure: Bad example - users have to remember which username applies to this particular website
Figure: Good example - users will always remember their primary email address​

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