The judge admitted on Twitter that she felt "nauseatingly tired" after a difficult boot camp this week, which saw each judge deciding which acts to send to judges' houses and which to go home.
Cheryl, 32, is mentoring the groups this year, after members of the public were able to cast their votes via Twitter on which judge received which category. Previously, it was producers who decided.
After yesterday's final boot camp, Cheryl said: "So happy with my groups. It's an awful part of the process but I am so happy with the outcome.
"Thank you so much and sorry to the groups that didn't make it tonight. Remember you got this far because of your potential. Keep going."
While Cheryl will take charge of the groups this year, Simon Cowell has the Overs, Rita Ora has the girls, and Nick Grimshaw has the boys.
Auditions continue this Saturday and Sunday on ITV.