Early check-in options in Bangkok?

I'm traveling to Bangkok with my family (wife and 7-year-old kid) in early February. Our flight lands at 4:30 am at DMK, and we'll be staying in Bangkok for three days before heading to Krabi.

Since this is a common scenario, I'm wondering if it's necessary to book our hotel room for the night we arrive or if there are better options available, such as early check-in, that could save us money on the one-night fare.

Can anyone provide some guidance on this?