Sleepless in Seattle” co-scripter Jeff Arch’s mounting pile of high-priority screenwriting assignments is leaving him sleepless in Virginia.

In addition to projects for Imagine Films and Paramount, the Clifton, Va.-based Arch is attached to a Penny Marshall directing project at Columbia, which may star Robert Redford.

While “Sleepless,” which opened Friday, is Arch’s first project to hit the big screen, another project of his, Disney’s adventure film “Iron Will,” opens later this year. Co-written by John Michael Hayes and Djordje Milicevic and directed by Charles Haid, the film stars Mackenzie Astin and Kevin Spacey.

Produced by Robert Schwartz and Patrick Palmer, “Iron Will” is the period story of a teenager who enters a 500-mile dogsled race to save his family’s farm.

First up on the slate for Arch is “Blue Moon,” the Columbia project on which Marshall is attached to direct. The romantic comedy is being jointly developed by Marshall’s Parkway Prods. and Redford’s Wildwood Enterprises. The film will be produced by Elliot Abbott and Barbara Maltby.

Described by Arch as being like “a dinner-jacket movie of the ’50s,””Blue Moon” is the story of a bakery girl who’s thrown into elegant society and gets into a romantic complication with two business partners. The project is currently being supervised by Columbia exec Amy Pascal.

Arch is currently writing two projects for Imagine Films –“The Georgia Waltz” and “The Diego Affair.”

To be produced by Brian Grazer, “The Georgia Waltz” is an adaptation of the Phillip Lee Bailey novel “Perfect Timing.” It’s the story of a Southern minister who leaves his home, family and job so he can rescue his old college love, who he discovers is homeless.

“The Diego Affair,” which will be a co-production of Imagine and Barry Levinson’s Baltimore Pictures, will be produced by Levinson and Mark Johnson. Based on an idea by Levinson and Grazer, the comedy of mistaken identity concerns two disgruntled government employees who chase a janitor around Washington, thinking he’s a spy.

Rounding out Arch’s project list is “Special Delivery,” which is in development at Paramount for a possible Christmas 1994 release.