Lethargy is a state of tiredness, weariness, fatigue, or lack of energy. It can be accompanied by depression, decreased motivation, or apathy. Lethargy can be a normal response to boredom, inadequate sleep, overexertion, overworking, stress, lack of exercise, or a symptom of a disorder. When part of a normal response, lethargy often resolves with rest, adequate sleep, decreased stress, and good nutrition.[21][22]

Thomas Goetz, the lead researcher of the work and a professor at the University of Konstanz in Germany, says the multiple types of boredom can be loosely characterized along two dimensions. First, whether it is associated with a positive (score of 1) or negative (score of 5) emotion, and second, by degree of arousal, from calm (score of 1) to fidgety (score of 5).
Boredom also plays a role in existentialist thought. Søren Kierkegaard and Friedrich Nietzsche were two of the first philosophers considered fundamental to the existentialist movement. Like Pascal, they were interested in people's quiet struggle with the apparent meaninglessness of life and the use of diversion to escape from boredom. Kierkegaard's Either/Or describes the rotation method, a method used by higher level aesthetes in order to avoid boredom. The method is an essential hedonistic aspect of the aesthetic way of life. For the aesthete, one constantly changes what one is doing in order to maximize the enjoyment and pleasure derived from each activity.
What can you do about boredom? Obviously, there are times when you are stuck. If you are listening to a lecture that you cannot leave, then you just need to find a way to get through it. When you have some control, though, use your understanding of boredom to help you out. If you can, try to do a meditation exercise to lower your arousal level. Also, keep some music handy. Music you enjoy can crowd out distractions in the environment. It can also influence your mood in positive ways to counteract the pain of being bored.  
Recent Examples on the Web Artist Support Pledge is just one of programs designed to alleviate economic hardship and collective ennui within early-career artist communities. — Anne Quito, Quartz, "Emerging artists pledge to buy each other’s work amid the coronavirus economic slowdown," 20 Mar. 2020 Douglas and Paula Rigby inevitably find no easy answers to their financial travails and everyday ennui. — oregonlive, "‘That Left Turn at Albuquerque’ offers noir-fiction staples, harsh look at American striving: book review," 20 Mar. 2020 The festival was initiated as a way to use community togetherness (and aromatherapy) to combat the ennui of the Great Depression. — Heather Arndt Anderson, Sunset Magazine, "The Best Spring Flower Festivals for Seeing the Season in Full Bloom," 10 Mar. 2020 Shake up the ennui this year with a silicon spatula bearing an illustration of Giggy, the beloved dog of Lisa Vanderpump, the reality-television doyenne and magnificent restaurateur, drawn by Ms. Vanderpump herself. — Helen Rosner, The New Yorker, "Holiday Gift Guide for Foodies: From Murderous Mermaid Salt to Lamps Made Out of Croissants," 12 Dec. 2019 Taylor-Joy, whose searching, wide-set eyes give her the mysterious beauty of an elegant reptile, makes a crackling transition from Emma’s too-cool-for-school ennui to a state of being where the very air around her feels electrified with uncertainty. — Stephanie Zacharek, Time, "A Gorgeous New Emma Adaptation Strikes Just the Right Balance of Modern and Authentic," 21 Feb. 2020 Suddenly, Juliana’s romantic ennui is interrupted by the reappearance, after an 11-year absence, of her scapegrace oldest brother. — Michael Dirda, Washington Post, "First published in 1924, ‘Still She Wished for Company’ makes for a delicious, if bittersweet Valentine’s Day treat," 12 Feb. 2020 Speaking of start-up ennui, more tech workers are seeking therapy — with the help of apps. — New York Times, "This Week in Business: No More E-Cigarettes at Walmart, and an Attack on the World’s Oil Supply," 22 Sep. 2019 While in years past, the top GIFs of the year have reflected a collective energy full of uncertainty and ennui, this year's crop, as curated by GIF master Giphy, is considerably more upbeat! — Aj Willingham And Andrea Diaz, CNN, "These were 2019's GIFs of the year and I Oop!," 17 Dec. 2019
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