At this age, pacing at night can be the result of abnormal sleep/wake cycles brought on by hormonal development and fluctuations. Spaying and neutering will often help this phenomenon, however, spay and neuter prior to 6 months of age is not recommended. “Colic” from intestinal parasites is another reason a cat this age may have sleeplessness and evening anxiety. Please see the article below on this disease. If you still seek further information, please visit our Ask The Vet page to submit a one on one consultation with a licensed veterinarian 24 hours a day, 7 days a week.