Daylight Saving Time Starts Tonight: How It Affects Sleep & Health

Lisa Bos · 2026-03-28

So, daylight saving time is kicking in tonight. You'll set your clocks forward one hour, and just like that, we all lose a precious hour of sleep. It might not sound like much, but trust me, your body notices. That small shift can throw your internal clock—your circadian rhythm—completely out of whack for days, even weeks. It's more than just feeling a bit groggy on Monday morning. This annual spring forward has real, measurable effects on our health and well-being. Let's break down what really happens when we mess with time. ### The Immediate Impact on Your Sleep Your sleep schedule gets hit first and hardest. Suddenly, you're trying to fall asleep when your body still thinks it's an hour earlier. You might lie there staring at the ceiling. Or you might fall asleep but wake up feeling completely unrested because your sleep cycles are disrupted. This isn't just about one night. It can take your body several days to fully adjust to the new light-dark cycle. During this adjustment period, you're likely to experience: - Reduced sleep quality and more frequent nighttime awakenings - Feeling less alert and more fatigued during the day - A harder time concentrating and focusing on tasks - Increased irritability and mood swings It's a rough transition, and it highlights just how delicate our sleep patterns really are. ### The Broader Health Consequences Beyond sleep, research has shown some pretty startling correlations. In the days immediately following the shift to daylight saving time, studies have noted a small but significant increase in certain health events. It's thought that the sleep deprivation and circadian disruption stress the body's systems. Your cardiovascular system takes a hit. There's a noted uptick in heart-related incidents. Your immune function can also dip temporarily, making you more susceptible to catching that cold that's going around the office. And if you struggle with mental health, this period can be particularly challenging, as the disruption can exacerbate feelings of anxiety or low mood. As one sleep researcher put it, "We are asking our bodies to do something they are not designed to do—to abruptly shift their biological timing. The consequences are felt across our physiology." ### Practical Tips for an Easier Transition Don't just resign yourself to a week of misery. You can take proactive steps to help your body adapt more smoothly. The key is to start preparing before the change even happens. First, adjust your schedule gradually. In the days leading up to the time change, try going to bed and waking up 15-20 minutes earlier each day. This softens the blow of the full one-hour shift. Second, prioritize light exposure. Get plenty of bright light, especially sunlight, in the morning after the change. This is the strongest signal to your brain that it's time to be awake and helps reset your internal clock. Here are a few more actionable tips: - Avoid caffeine and alcohol in the hours before bedtime, as they can further disrupt sleep. - Stick to a consistent wind-down routine to signal to your body that sleep is coming. - Make your bedroom a sleep sanctuary—cool, dark, and quiet. - Try not to nap excessively during the day, as it can make it harder to sleep at night. ### Looking at the Bigger Picture This annual debate about daylight saving time isn't just about convenience. It's a public health discussion. Some states are already moving to make daylight saving time permanent, while others advocate for sticking with standard time year-round. The argument often centers on which schedule is more aligned with our natural biology and promotes better sleep health. For now, we're stuck with the spring forward. But by understanding the impact and taking steps to mitigate it, you can protect your sleep and support your overall health during this disruptive week. Listen to your body, be kind to yourself, and give it the time it needs to adjust. After all, you can't argue with biology.