Most insomnia is not an illness or a physical condition so much as a symptom of another problem that may simply be a reaction to certain medications, anxiety about travel, or stress before a job interview.

• Aan illness or a physical condition so much as a symptom of another problem that may simply be a reaction to certain medications  
• Ban illness or a physical condition so much as symptomatic of another problem that may be a simple one, like a reaction caused by certain medications  
• Cso much an illness or a physical condition but a symptom of another problem that may be as simple as when certain medications cause a reaction  
• Dso much an illness or a physical condition, but it is a symptom of another problem, maybe a simple one like certain medications causing a reaction  
• Eso much an illness or a physical condition but symptomatic of another problem, maybe simply a reaction to certain medications