Difficulty switching off thoughts at night often occurs when the mind finally has space to process unresolved worries. Stress, anxiety, or emotional tension may surface once daily distractions fade. Overthinking can disrupt sleep and increase fatigue. Creating a calming bedtime routine, reducing screen time, and practicing slow breathing can help signal relaxation. Writing down worries before sleep may also reduce mental clutter. If racing thoughts persist, therapy can help address underlying anxiety and improve sleep quality.