For those who head to work feeling they could benefit from an extra hour's kip - this Oxford academic has your back.
Dr Paul Kelley has likened typical 9-5 working shifts to "torture" and said that they could pose a "serious threat" to employee health.
He says that prior to turning 55 years of age, the typical adult's circadian rhythms are out of sync with normal working hours. This can have a knock-on effect on productivity, mood and can even make employees feel ill or stressed.
Dr Kelley believes there's now a huge need to change the way society works, particularly in terms of what time work and school begins, so that we can give our body clocks a fighting chance.
"This is a huge society issue. Staff should start at 10am. We’ve got a sleep-deprived society," said Dr Kelley.
"We cannot change our 24-hour rhythms. You cannot learn to get up at a certain time. Your body will be attuned to sunlight and you’re not conscious of it because it reports to hypothalamus, not sight."
According to the NHS, one in three people suffer from poor sleep.
Effects of sleep deprivation can range from negative processing of emotions to a change in the way that people make decisions.
"Sleep is a requirement just like food. Good quality sleep ensures your mental and physical health remains optimal," Dr Nazim Nathani from the London Sleep Centre previously told HuffPost UK Lifestyle. "Lack of sleep has been attributed to hopelessness, memory problems and irritability."
Long-term health outcomes from chronic sleep deprivation include obesity, Type 2 diabetes, cardiovascular diseases and high blood pressure.
Dr Kelley said that "everybody is suffering and they don't have to". He believes that changes need to be made to the typical working day, particularly in terms of start time.
He also said this needs to be applied to all aspects of society, including hospitals and prisons.
"They wake up people and give people food they don't want," he said. "You're more biddable because you're totally out of it.
"Sleep deprivation is a torture."
We probably don't have to explain why you shouldn't reach for an espresso at 10 p.m. But, turns out, your afternoon coffee habit can affect you for longer than you'd expect. In fact, that caffeine can remain in your system for hours, making even a 4 p.m. pick-me-up a bad idea. Baron recommends steering clear by the early afternoon. And don't forget coffee-flavored treats, she warns. Your favorite cappuccino-flavored ice cream can give you a surprisingly strong jolt. Of course, you've probably heard that a little tea before bed is a good idea. The caffeine content is smaller than in coffee, and herbal "sleepy time" varieties often contain sleep-promoting herbs like valerian or chamomile that can, indeed, help you nod off.
Even if you know to avoid coffee and strong tea, you might be sabotaging your sleep with sneakier sources of caffeine, like chocolate. Dark chocolate, in particular, can pack a significant punch, says Baron, although it varies by brand. If you like to nibble on a square or two for dessert, you'll probably be fine, she says -- but an entire chocolate bar could have just as much caffeine as a soda. If you wouldn't drink one close to bed, you probably shouldn't indulge in a chocolate bar either.
Baron calls alcohol the "number one drug used for sleep," and it can, indeed, be tempting to unwind before bed with a glass of your favorite adult beverage. But you won't be doing yourself any sleep favors. While it might help you nod off initially, alcohol is disruptive to the later stages of sleep, which are important to memory and motor skills, according to recent research. And while alcohol might fuel deep sleep in the beginning of the night, the second half of your slumber will likely be more interrupted and full of strange dreams, Baron says, leaving you exhausted the next day.
You already know they're tough on your heart, but it turns out that fatty foods might also disrupt your sleep. A 2012 study found that a high-fat diet caused rats to sleep more during the day, an outcome with marked similarities to the daytime sleepiness experienced by many people who are overweight. The rats also had more fragmented, interrupted sleep, wrote Dr. Michael J. Breus in a HuffPost blog. A brain chemical called orexin might explain this relationship, since it's involved in both appetite and regulating the body's internal sleep-wake clock. Earlier research has also suggested a link between high-fat foods and disruptions to these circadian rhythms. Fatty foods can also lead to a general feeling of discomfort, Baron says, that can make falling asleep tricky. She suggests staying away from any sizable portions, as well as heavy, greasy foods too close to bed.
"Your body's not designed to be digesting food when it's sleeping," Baron says. Protein presents a particular digestion problem, since it's harder to break down than other nutrients, according to WebMD. That makes a meat-heavy meal a bad idea if it's too late in the evening. Of course, famed sleep-inducer turkey is also a protein. And while the bird does indeed contain tryptophan, the amino acid itself doesn't actually bring on sleepiness.
Turning up the heat is a well-known trigger for heartburn, especially if you lie down shortly after ingesting that fiery dish. But a small study suggests there may be something else at work. Researchers examined the effects of tabasco sauce and mustard on healthy men and their sleep. On the nights they ate spicy meals, they had more trouble falling asleep and got less sleep overall. The researchers noted a change in body temperature brought on by the spicy meal, the New York Times reported, which can confuse the brain, as core temperature naturally dips as bedtime approaches.
However, that doesn't mean acid reflux isn't a problem. Even if you already know to steer clear of spicy foods, fatty foods and heavy meals before bed, there are some more surprising causes of heartburn, like citrus, that also increase the stomach's acidity, and can keep you up at night, Baron explains.
We generally have nothing but praise for good old H2O, but there's no denying that too much liquid right before bed is likely to lead to, uh, interruptions, in your sleep. It's a delicate balance between staying hydrated and cutting off your fluid intake, but Baron says limiting fluid intake in the two hours leading up to bed is a good place to start. Foods with a high water content -- like a slice of watermelon for dessert -- can have you running to the loo, too. And so can that afore-mentioned cup of SleepyTime tea. "How big is that cup?" Baron says she asks patients. "Tea can be part of a nice, relaxing ritual, but if you have it an hour before bed it can have you up and using the bathroom," she says. And if you find yourself waking up in the middle of the night with a dry mouth, consider investing in a humidifier, she says, rather than keeping a glass on your bedside table.