Republican presidential contender Sen. Ted Cruz (R-Texas) lamented his lack of sleep on the campaign trail, listing it among the many "sacrifices for our campaign."
"Health and sleep are limited: Fighting morning and night for the future of our country ensures long nights and early mornings resulting in little to no sleep," Cruz said this week in his latest fundraising email. He told supporters he's "proud to be making" such sacrifices "on your behalf."
Sleep deprivation appears part of the presidential campaign, as the candidates crisscross the country with speeches, town halls, meet-and-greets, rallies, meetings and fundraisers.
But unfortunately for Cruz and his rivals for the presidency, there is a clear link between executive leadership and getting enough sleep. A study this year by consulting firm McKinsey and Harvard Business Review found that more than 40 percent of business leaders reported they don't get enough sleep at least four nights a week.
The researchers noted that sleep deprivation limited executives' ability to think of creative solutions to problems, consider other people's viewpoints, focus on results and support other people. It also led to leaders who were less engaged and more burned out.
Cruz's listing of sacrifices raised the ire of Sen. Elizabeth Warren (D-Mass.), who posted a lengthy rant on Twitter saying that many of the same sacrifices Cruz voluntarily makes for his campaign are a daily reality for working families. She attacked him for blocking policies that would ease problems for working families, like paid family leave and raising the minimum wage.