Primary Outcome Measures:
- next day performance in a standardised test of car driving [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: Yes ]
Secondary Outcome Measures:
- Compensatory Tracking Task (CTT) [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
- Rapid Visual Information Processing (RVIP) [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
- Sternberg's Short-term Memory Scanning task (STM) [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
- Critical Flicker Fusion (CFF) [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
- Digit Symbol Substitution Test (DSST) [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
- Choice Reaction Time (CRT) [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
- Leeds Sleep Evaluation Questionnaire and Leeds Analogue Rating Scales [ Time Frame: 9.5 hours post dose ] [ Designated as safety issue: No ]
The study is a single centre, randomised, double blind, placebo controlled 2-way crossover design in a group of 32 healthy male and female volunteers. The medications under investigation are eszopiclone and placebo. Volunteers will receive the study medications and placebo on the evening of Day 2 of each treatment period. Performance will be assessed on Day 3 of each treatment period. Each treatment period will be separated by at least a 7-day washout period.