Insomnia is a common sleep disorder that makes it difficult for people to fall asleep or stay asleep. This can lead to feeling tired and irritable during the day. Many factors can contribute to insomnia, including stress, anxiety, and certain medical conditions. People with insomnia may try various methods to improve their sleep, such as creating a relaxing bedtime routine or limiting screen time before bed. In some cases, consulting a healthcare professional may be necessary to address underlying issues or explore treatments like cognitive behavioral therapy or medication.