Sunday night blues, a feeling of dread before the start of the working week, is having a negative effect on worker wellbeing across the UK.
Nearly half (44%) of employees believe a four-day week will happen within the next five years compared to 37% of employers.
A government move to introduce a day-one right to request flexible working has received a mixed response from campaigners and employers.
Employees in the UK are working longer hours but are less productive than their European counterparts, according to the TUC