Timeshifter Takes Circadian App From Jet Lag to Night Shift, $5.3M Raised to Date

The astronaut-backed app that helps travelers beat jet lag is now targeting healthcare, energy and logistics workforces

A startup that has attempted to crack the code on beating jet lag has set its sights on the night shift.

Timeshifter, the circadian rhythm app that’s become a favorite among frequent flyers, has closed a new funding round — bringing its total raised to $5.3 million to date — as it pushes beyond travel and deeper into shift work and healthcare, where sleep disruption can mean an occupational hazard.

The company did not disclose the size of the new round, which was led by Skip Capital. Formula 1 champion Nico Rosberg, Axiom Space chief astronaut Michael López-Alegría, The Points Guy founder Brian Kelly and others also participated.

Notably, all investors are active Timeshifter users, the company said.

“The human and financial costs of ignoring circadian biology have been staggering,” Timeshifter co-founder and CEO Mickey Beyer-Clausen said. “People crossing time zones spend the first days of their trips fighting jet lag. The safety and health of shift workers are compromised. Athletes are competing when their bodies aren’t peaking. Medications and treatments are mistimed, reducing their efficacy. At Timeshifter, we’re building the missing layer in human performance, safety and health — circadian timing and control.”

The shift work app — which has been adopted by thousands of workers already, Timeshifter said — walks users through a personalized sleep, alertness and light exposure plan built around their schedule. Workers input their shifts, commute and get-ready time, and the app delivers timed push notifications with guidance on sleep, caffeine, melatonin and other circadian interventions. It can also flag fatigue risk, warning users when they’re most at risk of accidents or errors.

The underlying science, Timeshifter said, comes from co-founder and chief scientist Dr. Steven Lockley, a circadian rhythm researcher.

For proof, Timeshifter says, look no further than the pillow, where its jet lag app members (nearly 500,000 of them added in 2025 alone) are statistically likely to be snoozing away. Across more than 130,000 post-flight surveys, 96.4% of travelers who followed the app’s guidance did not experience severe or very severe jet lag.

The app has found its way into the wellness tourism business, with integration deals across United Airlines, Lufthansa, Swiss, Austrian Airlines and InterContinental Hotels & Resorts.

Timeshifter’s stand-alone shift work app is available on a 30-day free trial, after which it runs $6.99 a month or $69.99 a year. For its jet lag app, the first plan is free. After that, it’s $9.99 per plan or $24.99 a year for unlimited access.