This is your lightest lifting day of the week, and a good opportunity to double-check your form. My bench-press guide offers some ways to be sure you're lifting safely and effectively. I'm a fan of wrist straps here, to keep your wrists straight. If you haven't been using them, this is a good time to give them a try.
Keep in mind that although the weight is lighter, you're still doing a lot of reps. That means you'll be feeling the lifts by the end of the workout!