CDG Hotels airside?

There is, as far as I know, one airside hotel at CDG. It is a Yotel property and you need your boarding pass to access it. Typically, for flights I have taken online check in (and boarding passes) are available 24 hours before the flight. You might want to check with you airline to see if that is available.

If you do the search:
charles de gaulle airport hotels terminal 2e
in any browser you will get a list of hotels easily accessible to the airport, a map where they are located, and links to the hotels so you can see the amenities. The Sheraton is directly next to terminal 2E. The others are easily accessible with the airport internal trains. We usually stay at the Hilton using air miles and our flight is always out of 2E.

I have stayed at the Sheraton. It is not airside, but it is a quick, easy walk to terminal 2E.

We stay at the Novotel at Roissypole when we stay at the airport -- it is nothing much to hop on the CDGVAL adjacent to the hotel in the morning and ride to the terminal. So if you can't enter airside the day before that is an option.

I’ve stayed at the Sheraton, I won’t be staying there again. I’m sorry it’s way overpriced and because they know it’s basically a captive audience thr rooms are not in great shape and the service was beyond pathetically bad

I stay at the Hilton because I can use my points and it’s an easy commute to terminal to catch my flight.

We stayed here in May of 2023. Lovely place. Shuttle pickup at CDG and return. Great communication. Restaurant and bar on property.

Le Mesnil-Amelot
May 22, 2023 - May 23, 2023
Courtyard by Marriott Paris Roissy Charles de Gaulle
Airport

Hilton is close and easy, but if you're planning on breakfast check their opening times (may not be early enough to fit into your plans).

Also at the Hilton if you ask you can send them the link for your passes and they'll print them, or there is (or was) a business center where you can DIY. The other good thing about staying at an airport hotel the night before is, at least if you're on Delta, you need to fill out online forms and sometimes scan a passport so you need good internet.

The end of February I stayed at the CDG Citizen M the night before an early flight. LOVED it!! After dinner I made the very short walk to the terminal and checked out where, and how, I had to go the next morning. It took a little longer than I expected which made me ever so grateful the next morning when I knew where I was going, rather groggy. I will do this every time now. You can print your boarding passes at the self-service check in terminals. Citizen M can probably help with this, also. Your phone can also show a boarding pass.