Happy Sunday! As always, Links We Love brings you our favorite health and fitness information from around the web. This week, we're looking at fitness and running, from the deets on bike messengers' workouts to the strangest sleeping habits ever. We want to spread the love and share kickass content in the wellness world, and here are our picks:

How Intense Study May Harm Our Workouts
Boy, is my body exhausted — from hitting the books? Scientific research suggests mental exertion may leave us feeling physically depleted. (via the Well Blog)

Study

Infographic: Special Delivery
And you thought your walk to the office was a workout. The average San Francisco bike messenger burns nearly 3,000 calories in one day of deliveries. (via Runtastic)

The Weirdest Sleeping Habits From Fiction
Sherlock Holmes won’t rest until he’s closed his case; Murakami’s Eri dozes for months. From sleepwalkers to people whose dreams become reality, fictional characters are often the strangest sleepers among us. (via Bookish)

Man Sleeping
Photo: Bigstock

An Interview With The Oatmeal
Matthew Inman, creator of the blog The Oatmeal, talks to Runner’s World about tackling deer, his illicit love affair with gummy bears, and running away from his biggest fears. (via Runner’s World)

Your $1,000-a-Year Lunch Habit
A daily turkey sandwich from the shop next door to our office… or a summer vacation? According to a Visa survey, eat-lunch-outers spend nearly $1,000 on their midday munchies every year. (via Learnvest)

Lunch

What were some of your favorite links from around the web? Let us know in the comments below or tweet directly at @greatist!

[Note: These are outside sources, which don't always follow Greatist's strict (and awesome) research standards.]

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