Featured below are airline seat "sleep ratings" - based on a range of comfort factors.

Eg: sleeping on one's back, sleeping on your side, seat length, surface/cushion comfort, shoulder width, seat recline angle etc

"a great sleep"

FIRST CLASS

BUSINESS CLASS

Air France

ANA

Asiana Airlines

British Airways

Cathay Pacific

China Airlines

China Eastern

Emirates

Etihad Airways

Gulf Air

Japan Airlines

Jet Airways

Korean Air

Malaysia Airlines

Qantas

Oman Air

Qatar Airways

Singapore Airlines

Swiss

TAM Brazilian

Thai Airways

Turkish Airlines

Air Canada

Air New Zealand

British Airways

Cathay Pacific

Continental Airlines  (new seats)

Delta Air Lines

Emirates  (A380)

Etihad Airways

Hainan Airlines

Jet Airways

Kingfisher Airlines

Oman Air

Qantas  (A380)

Qatar Airways  (B777)

Singapore Airlines  (A380 + B777-300)

South African Airways

SWISS  (new seats)

Turkish Airlines  (B77-300)

United Airlines  (new seats)

V Australia

Virgin Atlantic

"a good sleep"

FIRST CLASS

BUSINESS CLASS

Air India

Air Tahiti Nui

American Airlines

LAN Airlines

Lufthansa

United Airlines

Aeroflot

Air France

ANA

American Airlines

Asiana Airlines

Avianca

bmi British Midland

China Airlines

China Southern

Emirates   (excl A380)

EVA Air

Gulf Air

Iberia

Japan Airlines

Kenya Airways

KLM

LAN Airlines

Korean Air

Lufthansa

Malaysia Airlines

Pakistan Int'l

Qantas   (excl A380)

Qatar Airways   (excl B777)

Royal Brunei Airlines

Royal Jordanian

Singapore Airlines   (excl A380 + B777-300)

Thai Airways

TAM Airlines

Turkish Airlines

"okay comfort"

FIRST CLASS

BUSINESS CLASS

Air Jamaica

Dragonair

Alitalia

Austrian

SAS Scandinavian

Brussels Airlines

SriLankan Airlines

TAP Air Portugal

"disturbed sleep"

FIRST CLASS

BUSINESS CLASS

Kuwait Airways

Egyptair

Saudi Arabian Airlines

Kuwait Airways

LOT Polish Airlines

Saudi Arabian Airlines

"uncomfortable"

FIRST CLASS

BUSINESS CLASS

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Biman Bangladesh

Czech Airlines

Egyptair