Regarding sleep, the most common feedback is not that people feel "tired," but rather that the quality of their sleep feels "deeper" or more continuous
Relevant articles were identified by PubMed search from January 1, 1980 to March 31, 2016 and through hand search of relevant reference articles
It's clear that fiber greatly benefits your overall health, but maxing out your daily intake when your body isn't used to it can be challenging
Nature 389 , 183186 (1997)
Possible side effects: Nausea, diarrhea, vomiting, constipation, abdominal pain, headache, fatigue, dyspepsia, dizziness, abdominal distension, belching, hypoglycemia, flatulence, gastroenteritis, and gastroesophageal reflux disease