Lined up on the side of the pitch, the portable bedrooms gave players the perfect chance to catch 40 winks and recover.
So why did they fail?
Swansea were among the first to go all-out for Snoozeboxes.
Under then-boss Garry Monk, 30 of them were installed – one for every player – at their multi-million pound Fairwood training base in 2015.
Each inflatable room had enough space for a double bed.
They even had each player's shirt number on the door. Leon Britton posed proudly in front of his.
Former Swans midfielder Jack Cork was a fan.
He told the Guardian: "I tell people I'm in a sleep pod and they're like, 'What's that?'
"It's just literally a door and a room with a bed in it but I'm straight in there and straight down, otherwise I'd have to go home.
"I live about half an hour away and when I come back it's school traffic, so for me it's easier to get your head down in the pod."
But the pods only lasted for pre-season before being discarded.
One Swansea staff member said: "It was a fad. Two or three people used them but they weren't much use. Most places now have some form of a hotel at their ground.
"We had the double training sessions at 11am and 4pm in 2015, but most players lived near the ground so just went home."
Frank de Boer remained a fan, however, and it was during his Crystal Palace tenure that he decided to use the pods.
But they lasted about as long as he did.
How did Snoozeboxes work?
The cube-like structures – initially made from converted shipping containers – became solid when inflated with air.
Let the air out and they folded down simply, allowing easy transportation.
Some boasted a wet-room shower, air conditioning, wi-fi and USB devices.
Single beds or double beds could go in them and they were designed to reduce noise and light levels.
Some 20 pop-up rooms which measured 2.3m x 2.3m x 2.4m and featured a USB port and LED lighting were pitched on the side of Palace's training ground.
They were used for rest in-between double training sessions at the start of this season.
The pods were on-site for five days – the same number of games before de Boer was sacked – only to be removed after a trial.
Some players liked them, but others reportedly "struggled to sleep during the hot weather at the start of the summer", said the Evening Standard.
It appears the pods made sleep difficult – rendering them useless for their sole purpose.
The scheme never caught on, with bigger clubs such as Manchester City building their own hotel at their £200million training academy.
Each of the 32 en-suite rooms is decorated with "sleep-inducing" wallpaper which is light green and features ever decreasing circles, reports the BBC.
Many Manchester United fans dozed off watching Louis van Gaal's style of football.
But he also took sleep seriously, installing high-tech pods at Carrington when he arrived in 2014.
The club went even further in 2016, signing a five-year deal with mattress and pillow-maker Mlily.
Bournemouth believed giving players orange glasses was a good way to send them off.
But the pop-up bedrooms seen at Swansea and Palace never really caught on.
And things went from bad to worse when Snoozebox entered administration in November last year.
That came after their contract to provide accommodation for security staff at the 2012 Olympic games turned into a "financial nightmare".
The contract to house 3,500 security staff at a site in Hainault, Essex, resulted in a shortfall of about £1.6m.
What looked to be a perfect way to boost players' recovery turned into a nightmare.
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