Kuala Lumpur Malaysia airport Terminal M to Klia2 and sleeping overnight at Terminal M

I will traveling to Kuala Lumpur on Qatar Airlines which lands at terminal M. After few hours I will catch a flight to Jakarta, Indonesia from KLIA2.

Transferring from Terminal M to KLIA2, do I have to pass through immigration first at Terminal M or terminal M and KLIA2 connected terminals?
On my way back I will be departing from at 7 in the morning. I am considering staying overnight at the airport. Is it possible to sleep at airport overnight? Are there any good places to sleep at airport?

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Kuala Lumpur Malaysia airport Terminal M to Klia2 and sleeping overnight at Terminal M - Woman Walking on Pathway While Strolling Luggage

Kuala Lumpur Malaysia airport Terminal M to Klia2 and sleeping overnight at Terminal M - Woman Sitting on Luggage

Kuala Lumpur Malaysia airport Terminal M to Klia2 and sleeping overnight at Terminal M - Red Airplane

Can you stay in Kuala Lumpur airport overnight?

Sleeping in Kuala Lumpur Airport No matter where you sleep, bring eyeshades and earplugs or noise cancelling headphones, as this airport is busy around the clock. That said, while the airport is open 24-hours, some travellers found themselves restricted landside if they tried to clear security late at night.

Does Kuala Lumpur airport have sleeping pods?

Nap cabins or sleeping pods in Kuala Lumpur airport: the Rest N Go lounge. This exclusive lounge in KLIA's satellite building puts comfortable massage chairs at the travellers' disposal so that they can relax and unwind before their next flight. Every chair incorporates power outlets to charge your electronic devices.

Can I stay overnight at KLIA2?

At the klia2, If you need a night-stay or a short nap before your next flight, you can easily find hotel room located inside the klia2 terminal or just short walking distance to the terminal. The Tune Hotel klia2 and the Capsule by Container Hotel are the favourite choices of many passengers.

Does KLIA have a transit hotel?

The Sama-Sama Express KLIA is a transit hotel situated at the Satellite A building of the Kuala Lumpur International Airport (KLIA). The airside hotel is mainly for transit passengers who do not need to clear the immigration and go through custom for luggage checked.

MALAYSIA CAPSULE HOTEL (Sleeping in Kuala Lumpur Airport)

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Naim Benjelloun, Oleksandr Pidvalnyi, Anna Shvets, Tanathip Rattanatum