If flying wasn't already stressful enough, an airline is pioneering a new technology to let everyone know just how stressed you really are.
British Airways has developed a "happiness blanket", which will analyse the "meditative state" of fliers and change colours according to the passenger's mental state.
Upon boarding, fliers will be required to affix a headband to their head. The headband will then send brain-waves via bluetooth to the high-tech blanket, which is embedded with fibre-optic LEDs that change colour to reflect the person's mood.
When the wearer is calm and relaxed, the blanket will glow blue; when they are stressed or anxious, it will glow red.
The airline will analyse data from the blankets to evaluate their in-flight services, including the timing of meals and movie options.
It will also allow flight attendants to better improve their service, letting them know the best time to approach a potentially grumpy passenger.
Dozens of premium-class volunteers tested the devices on trans-Atlantic flight, to some success - the airline found moods tended to fluctuate at the beginning of a flight, but improved when meals arrived and passengers were sleeping.
The blanket has not been approved for customer use just yet - it's unclear if it will become a permanent feature, and if so, if people in the cheap seats will get the chance to use them.