Sleep problems or insomnia can arise due to stress, illness, physical pain, caffeine intake, technology use, shift work or some disruption in normal routine. Ongoing sleep disruptions may indicate the presence of a sleep or mental health disorder. Common symptoms include being unable to fall asleep, waking several times at night, or feeling drained and tired when it’s time to wake up. Sleep issues can lead to irritability, poor concentration, impaired memory, daytime napping, lethargy and low mood.