Half of people complained that the boundary between work and home had become "increasingly blurred". And the impact of that has disproportionately affected women, with 46% concerned about burnout - compared to 35% of men.
Meanwhile, 24% of women said the pandemic had a negative impact on their work-life balance. That compares to 16% of men.
Debbie Bullock, wellbeing lead at Aviva, told the BBC's Today programme that the pandemic and lockdown had "given people pause for thought about where work fits into their lives".
She added that technology and the digital age meant it had "become harder for some people to switch off" from work.
"The pandemic may have been a collective experience, but the impact has been fragmented in so many ways, with women especially facing particularly acute stresses from the blurring of lines between home and work," Ms Bullock said.
She said it was important for employers to be aware and respond to the difficulties staff are facing and take action to help: "If you don't make time for wellness you are going to have to potentially make time for illness."
Nick said: "From a business perspective, happy [and] satisfied people will stick around and do their best work, but also, at the end of the day, what's the point of always doing more if it makes us miserable?"
Aviva's study of more than 2,000 employees of larger companies found that just 14% would favour returning to the office full time, with 15% saying they would prefer to work from home five days a week.