Sources close to the rapper tell TMZ ... the seizures that forced him into the hospital Sunday were due to a super busy schedule mixed with the fact he was getting NO sleep. TMZ was told the attack had nothing to do with him frequently sipping lean.
As TMZ reported ... Weezy was the picture of health onstage at back-to-back concerts before the seizures struck. However, TMZ was told he was going out after shows, and then straight to the studio, and the lack of rest triggered the emergency.
TMZ's sources say Wayne's been advised to avoid overdoing it on tour, and he'll be taking two weeks off for some much needed R&R ... his next show is September 23 and TMZ was told he'll be there.
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