Why are Mondays always the worst day of the week?

Mondays are often considered the worst day of the week because they mark the end of the weekend and the return to work or school routines, which can feel daunting after a period of relaxation. Many people experience a "Monday blues" due to the abrupt shift in mindset and the pressure of a full week ahead. Additionally, sleep disruption over the weekend can leave individuals feeling fatigued and unmotivated, further contributing to the negative perception of Mondays.