One of the five General Purpose Computers that run the shuttle awakened the Atlantis malfunctioned today, triggering an alarm that woke up the crew members about an hour and half after they went to sleep.

The crew members are not in any danger. The space agency said the crew performed a standard 30-minute malfunction procedure to transition systems management from GPC-4 to GPC-2. The GPC-4 malfunction caused the system to go off the shuttle’s network.

The crew will perform troubleshooting on Friday. As the alarm interrupted the sleep of eh crew, they will have half an hour more to rest than originally planned. The crew will continue the transfer of cargo between the shuttle and station. The task is about 70 percent complete.